64977931 has 2 divisors, whose sum is σ = 64977932. Its totient is φ = 64977930.

The previous prime is 64977919. The next prime is 64977943. The reversal of 64977931 is 13977946.

It is a balanced prime because it is at equal distance from previous prime (64977919) and next prime (64977943).

It is a cyclic number.

It is not a de Polignac number, because 64977931 - 2¹³ = 64969739 is a prime.

It is a super-2 number, since 2×64977931² = 8444263034081522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64977901) 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, 32488965 + 32488966.

It is an arithmetic number, because the mean of its divisors is an integer number (32488966).

Almost surely, 2^64977931 is an apocalyptic number.

64977931 is a deficient number, since it is larger than the sum of its proper divisors (1).

64977931 is an equidigital number, since it uses as much as digits as its factorization.

64977931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 46.

The square root of 64977931 is about 8060.8889708270. Note that the first 3 decimals coincide. The cubic root of 64977931 is about 402.0270664020.

The spelling of 64977931 in words is "sixty-four million, nine hundred seventy-seven thousand, nine hundred thirty-one".