165257431 has 2 divisors, whose sum is σ = 165257432. Its totient is φ = 165257430.

The previous prime is 165257401. The next prime is 165257437. The reversal of 165257431 is 134752561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165257431 - 2¹¹ = 165255383 is a prime.

It is a super-2 number, since 2×165257431² = 54620037001439522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165257437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82628715 + 82628716.

It is an arithmetic number, because the mean of its divisors is an integer number (82628716).

Almost surely, 2^165257431 is an apocalyptic number.

165257431 is a deficient number, since it is larger than the sum of its proper divisors (1).

165257431 is an equidigital number, since it uses as much as digits as its factorization.

165257431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 165257431 is about 12855.2491613348. The cubic root of 165257431 is about 548.7657513168.

The spelling of 165257431 in words is "one hundred sixty-five million, two hundred fifty-seven thousand, four hundred thirty-one".