649536831 has 36 divisors (see below), whose sum is σ = 1022299200. Its totient is φ = 396938880.

The previous prime is 649536821. The next prime is 649536847. The reversal of 649536831 is 138635946.

It is not a de Polignac number, because 649536831 - 2¹⁰ = 649535807 is a prime.

It is a super-2 number, since 2×649536831² = 843796189651045122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649536821) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 97495 + ... + 103943.

It is an arithmetic number, because the mean of its divisors is an integer number (28397200).

Almost surely, 2^649536831 is an apocalyptic number.

649536831 is a deficient number, since it is larger than the sum of its proper divisors (372762369).

649536831 is a wasteful number, since it uses less digits than its factorization.

649536831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6524 (or 6502 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 649536831 is about 25486.0124578169. The cubic root of 649536831 is about 866.0333051175.

The spelling of 649536831 in words is "six hundred forty-nine million, five hundred thirty-six thousand, eight hundred thirty-one".