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145565721 = 3372472341
BaseRepresentation
bin10001010110100…
…10100000011001
3101010220111122000
420223102200121
5244231100341
622235551213
73415200600
oct1053224031
9333814560
10145565721
1175193754
12408bb509
1324208782
1415492a37
15cba58b6
hex8ad2819

145565721 has 48 divisors (see below), whose sum is σ = 256308480. Its totient is φ = 81375840.

The previous prime is 145565711. The next prime is 145565729. The reversal of 145565721 is 127565541.

It is not a de Polignac number, because 145565721 - 26 = 145565657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145565729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61011 + ... + 63351.

It is an arithmetic number, because the mean of its divisors is an integer number (5339760).

Almost surely, 2145565721 is an apocalyptic number.

It is an amenable number.

145565721 is a deficient number, since it is larger than the sum of its proper divisors (110742759).

145565721 is a wasteful number, since it uses less digits than its factorization.

145565721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411 (or 2398 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 145565721 is about 12065.0619973542. The cubic root of 145565721 is about 526.0411339496.

It can be divided in two parts, 1455 and 65721, that added together give a palindrome (67176).

The spelling of 145565721 in words is "one hundred forty-five million, five hundred sixty-five thousand, seven hundred twenty-one".

Divisors: 1 3 7 9 21 27 47 49 63 141 147 189 329 423 441 987 1269 1323 2303 2341 2961 6909 7023 8883 16387 20727 21069 49161 62181 63207 110027 114709 147483 330081 344127 442449 770189 990243 1032381 2310567 2970729 3097143 5391323 6931701 16173969 20795103 48521907 145565721