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71131345 = 5192925819
BaseRepresentation
bin1000011110101…
…10000011010001
311221211211212021
410033112003101
5121202200340
611020331441
71522415005
oct417260321
9157754767
1071131345
113717403a
121b9a3b81
131197676c
149638705
1563a0e4a
hex43d60d1

71131345 has 16 divisors (see below), whose sum is σ = 92952000. Its totient is φ = 52049088.

The previous prime is 71131343. The next prime is 71131369. The reversal of 71131345 is 54313117.

It is a cyclic number.

It is not a de Polignac number, because 71131345 - 21 = 71131343 is a prime.

It is a super-3 number, since 3×711313453 (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (71131343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10155 + ... + 15664.

It is an arithmetic number, because the mean of its divisors is an integer number (5809500).

Almost surely, 271131345 is an apocalyptic number.

It is an amenable number.

71131345 is a deficient number, since it is larger than the sum of its proper divisors (21820655).

71131345 is a wasteful number, since it uses less digits than its factorization.

71131345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25872.

The product of its digits is 1260, while the sum is 25.

The square root of 71131345 is about 8433.9400638136. The cubic root of 71131345 is about 414.3369583575.

The spelling of 71131345 in words is "seventy-one million, one hundred thirty-one thousand, three hundred forty-five".

Divisors: 1 5 19 29 95 145 551 2755 25819 129095 490561 748751 2452805 3743755 14226269 71131345