64715531 has 2 divisors, whose sum is σ = 64715532. Its totient is φ = 64715530.

The previous prime is 64715513. The next prime is 64715551. The reversal of 64715531 is 13551746.

Together with previous prime (64715513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64715531 - 2¹⁸ = 64453387 is a prime.

It is a super-2 number, since 2×64715531² = 8376199905223922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64715551) 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 as a sum of consecutive naturals, namely, 32357765 + 32357766.

It is an arithmetic number, because the mean of its divisors is an integer number (32357766).

Almost surely, 2^64715531 is an apocalyptic number.

64715531 is a deficient number, since it is larger than the sum of its proper divisors (1).

64715531 is an equidigital number, since it uses as much as digits as its factorization.

64715531 is an odious number, because the sum of its binary digits is odd.

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

The square root of 64715531 is about 8044.5963851520. The cubic root of 64715531 is about 401.4851684453.

The spelling of 64715531 in words is "sixty-four million, seven hundred fifteen thousand, five hundred thirty-one".