64711931 has 2 divisors, whose sum is σ = 64711932. Its totient is φ = 64711930.

The previous prime is 64711919. The next prime is 64711937. The reversal of 64711931 is 13911746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64711931 - 2¹⁰ = 64710907 is a prime.

It is a super-2 number, since 2×64711931² = 8375268027497522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (64711937) 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, 32355965 + 32355966.

It is an arithmetic number, because the mean of its divisors is an integer number (32355966).

Almost surely, 2^64711931 is an apocalyptic number.

64711931 is a deficient number, since it is larger than the sum of its proper divisors (1).

64711931 is an equidigital number, since it uses as much as digits as its factorization.

64711931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 64711931 is about 8044.3726293602. The cubic root of 64711931 is about 401.4777236924.

The spelling of 64711931 in words is "sixty-four million, seven hundred eleven thousand, nine hundred thirty-one".