64906931 has 2 divisors, whose sum is σ = 64906932. Its totient is φ = 64906930.

The previous prime is 64906889. The next prime is 64906967. The reversal of 64906931 is 13960946.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64906931 is a prime.

It is a super-2 number, since 2×64906931² = 8425819383677522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64906631) 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, 32453465 + 32453466.

It is an arithmetic number, because the mean of its divisors is an integer number (32453466).

Almost surely, 2^64906931 is an apocalyptic number.

64906931 is a deficient number, since it is larger than the sum of its proper divisors (1).

64906931 is an equidigital number, since it uses as much as digits as its factorization.

64906931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 64906931 is about 8056.4837863674. The cubic root of 64906931 is about 401.8805842347.

The spelling of 64906931 in words is "sixty-four million, nine hundred six thousand, nine hundred thirty-one".