649585931 has 2 divisors, whose sum is σ = 649585932. Its totient is φ = 649585930.

The previous prime is 649585921. The next prime is 649585961. The reversal of 649585931 is 139585946.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649585931 is a prime.

It is a super-2 number, since 2×649585931² = 843923763506273522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649585931.

It is not a weakly prime, because it can be changed into another prime (649585921) 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, 324792965 + 324792966.

It is an arithmetic number, because the mean of its divisors is an integer number (324792966).

Almost surely, 2^649585931 is an apocalyptic number.

649585931 is a deficient number, since it is larger than the sum of its proper divisors (1).

649585931 is an equidigital number, since it uses as much as digits as its factorization.

649585931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 50.

The square root of 649585931 is about 25486.9757130971. The cubic root of 649585931 is about 866.0551263917.

The spelling of 649585931 in words is "six hundred forty-nine million, five hundred eighty-five thousand, nine hundred thirty-one".