64957631 has 2 divisors, whose sum is σ = 64957632. Its totient is φ = 64957630.

The previous prime is 64957601. The next prime is 64957691. The reversal of 64957631 is 13675946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64957631 - 2²² = 60763327 is a prime.

It is a super-2 number, since 2×64957631² = 8438987650264322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64957601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32478815 + 32478816.

It is an arithmetic number, because the mean of its divisors is an integer number (32478816).

Almost surely, 2^64957631 is an apocalyptic number.

64957631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64957631 is an equidigital number, since it uses as much as digits as its factorization.

64957631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 64957631 is about 8059.6297061341. The cubic root of 64957631 is about 401.9851957783.

The spelling of 64957631 in words is "sixty-four million, nine hundred fifty-seven thousand, six hundred thirty-one".