64917973 has 2 divisors, whose sum is σ = 64917974. Its totient is φ = 64917972.

The previous prime is 64917971. The next prime is 64917991. The reversal of 64917973 is 37971946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58400164 + 6517809 = 7642^2 + 2553^2 .

It is a cyclic number.

It is not a de Polignac number, because 64917973 - 2¹ = 64917971 is a prime.

Together with 64917971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64917971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32458986 + 32458987.

It is an arithmetic number, because the mean of its divisors is an integer number (32458987).

Almost surely, 2^64917973 is an apocalyptic number.

It is an amenable number.

64917973 is a deficient number, since it is larger than the sum of its proper divisors (1).

64917973 is an equidigital number, since it uses as much as digits as its factorization.

64917973 is an evil number, because the sum of its binary digits is even.

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

The square root of 64917973 is about 8057.1690437771. The cubic root of 64917973 is about 401.9033723187.

The spelling of 64917973 in words is "sixty-four million, nine hundred seventeen thousand, nine hundred seventy-three".