649529331 has 32 divisors (see below), whose sum is σ = 973126656. Its totient is φ = 385167200.

The previous prime is 649529303. The next prime is 649529333. The reversal of 649529331 is 133925946.

649529331 = 419² + 420² + ... + 1264².

It is a happy number.

It is not a de Polignac number, because 649529331 - 2⁷ = 649529203 is a prime.

It is a super-2 number, since 2×649529331² = 843776703658615122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649529333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185941 + ... + 189401.

It is an arithmetic number, because the mean of its divisors is an integer number (30410208).

Almost surely, 2^649529331 is an apocalyptic number.

649529331 is a deficient number, since it is larger than the sum of its proper divisors (323597325).

649529331 is a wasteful number, since it uses less digits than its factorization.

649529331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544 (or 3522 counting only the distinct ones).

The product of its digits is 174960, while the sum is 42.

The square root of 649529331 is about 25485.8653178581. The cubic root of 649529331 is about 866.0299718322.

The spelling of 649529331 in words is "six hundred forty-nine million, five hundred twenty-nine thousand, three hundred thirty-one".