649223631 has 12 divisors (see below), whose sum is σ = 1071734352. Its totient is φ = 370984896.

The previous prime is 649223611. The next prime is 649223633. The reversal of 649223631 is 136322946.

649223631 is a `hidden beast` number, since 649 + 2 + 2 + 3 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 649223631 - 2²² = 645029327 is a prime.

It is a super-2 number, since 2×649223631² = 842982646097648322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649223633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5152506 + ... + 5152631.

It is an arithmetic number, because the mean of its divisors is an integer number (89311196).

Almost surely, 2^649223631 is an apocalyptic number.

649223631 is a deficient number, since it is larger than the sum of its proper divisors (422510721).

649223631 is a wasteful number, since it uses less digits than its factorization.

649223631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10305150 (or 10305147 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 649223631 is about 25479.8671699834. The cubic root of 649223631 is about 865.8940852783.

The spelling of 649223631 in words is "six hundred forty-nine million, two hundred twenty-three thousand, six hundred thirty-one".