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155121450 = 235211412293
BaseRepresentation
bin10010011111011…
…11011100101010
3101210212222121220
421033233130222
5304202341300
623220442510
73562340061
oct1117573452
9353788556
10155121450
117a620050
1243b49436
13261a3053
141685d1d8
15d941da0
hex93ef72a

155121450 has 96 divisors (see below), whose sum is σ = 430097472. Its totient is φ = 36672000.

The previous prime is 155121433. The next prime is 155121451. The reversal of 155121450 is 54121551.

It is a self number, because there is not a number n which added to its sum of digits gives 155121450.

It is not an unprimeable number, because it can be changed into a prime (155121451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66504 + ... + 68796.

It is an arithmetic number, because the mean of its divisors is an integer number (4480182).

Almost surely, 2155121450 is an apocalyptic number.

155121450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155121450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215048736).

155121450 is an abundant number, since it is smaller than the sum of its proper divisors (274976022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155121450 is a wasteful number, since it uses less digits than its factorization.

155121450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360 (or 2355 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 155121450 is about 12454.7761922886. The cubic root of 155121450 is about 537.3087980466.

The spelling of 155121450 in words is "one hundred fifty-five million, one hundred twenty-one thousand, four hundred fifty".

Divisors: 1 2 3 5 6 10 11 15 22 25 30 33 41 50 55 66 75 82 110 123 150 165 205 246 275 330 410 451 550 615 825 902 1025 1230 1353 1650 2050 2255 2293 2706 3075 4510 4586 6150 6765 6879 11275 11465 13530 13758 22550 22930 25223 33825 34395 50446 57325 67650 68790 75669 94013 114650 126115 151338 171975 188026 252230 282039 343950 378345 470065 564078 630575 756690 940130 1034143 1261150 1410195 1891725 2068286 2350325 2820390 3102429 3783450 4700650 5170715 6204858 7050975 10341430 14101950 15512145 25853575 31024290 51707150 77560725 155121450