64157531 has 2 divisors, whose sum is σ = 64157532. Its totient is φ = 64157530.

The previous prime is 64157477. The next prime is 64157539. The reversal of 64157531 is 13575146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64157531 - 2²² = 59963227 is a prime.

It is a super-2 number, since 2×64157531² = 8232377568031922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64157539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32078765 + 32078766.

It is an arithmetic number, because the mean of its divisors is an integer number (32078766).

Almost surely, 2^64157531 is an apocalyptic number.

64157531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64157531 is an equidigital number, since it uses as much as digits as its factorization.

64157531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 32.

The square root of 64157531 is about 8009.8396363473. The cubic root of 64157531 is about 400.3279206799.

The spelling of 64157531 in words is "sixty-four million, one hundred fifty-seven thousand, five hundred thirty-one".