649977531 has 32 divisors (see below), whose sum is σ = 1012359168. Its totient is φ = 363242880.

The previous prime is 649977529. The next prime is 649977533. The reversal of 649977531 is 135779946.

It is an interprime number because it is at equal distance from previous prime (649977529) and next prime (649977533).

It is not a de Polignac number, because 649977531 - 2¹ = 649977529 is a prime.

It is a super-2 number, since 2×649977531² = 844941581609711922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649977533) 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, 441126 + ... + 442596.

It is an arithmetic number, because the mean of its divisors is an integer number (31636224).

Almost surely, 2^649977531 is an apocalyptic number.

649977531 is a deficient number, since it is larger than the sum of its proper divisors (362381637).

649977531 is a wasteful number, since it uses less digits than its factorization.

649977531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931.

The product of its digits is 1428840, while the sum is 51.

The square root of 649977531 is about 25494.6569108117. The cubic root of 649977531 is about 866.2291239303.

The spelling of 649977531 in words is "six hundred forty-nine million, nine hundred seventy-seven thousand, five hundred thirty-one".