649397331 has 96 divisors (see below), whose sum is σ = 1162377216. Its totient is φ = 357696000.

The previous prime is 649397317. The next prime is 649397339. The reversal of 649397331 is 133793946.

It is a happy number.

It is not a de Polignac number, because 649397331 - 2⁶ = 649397267 is a prime.

It is a super-2 number, since 2×649397331² = 843433787019847122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649397339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1408441 + ... + 1408901.

It is an arithmetic number, because the mean of its divisors is an integer number (12108096).

Almost surely, 2^649397331 is an apocalyptic number.

649397331 is a deficient number, since it is larger than the sum of its proper divisors (512979885).

649397331 is a wasteful number, since it uses less digits than its factorization.

649397331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 523 counting only the distinct ones).

The product of its digits is 367416, while the sum is 45.

The square root of 649397331 is about 25483.2755155219. The cubic root of 649397331 is about 865.9713018099.

The spelling of 649397331 in words is "six hundred forty-nine million, three hundred ninety-seven thousand, three hundred thirty-one".