631308681 has 16 divisors (see below), whose sum is σ = 944536320. Its totient is φ = 416703600.

The previous prime is 631308677. The next prime is 631308697. The reversal of 631308681 is 186803136.

It is not a de Polignac number, because 631308681 - 2² = 631308677 is a prime.

It is a super-2 number, since 2×631308681² = 797101301411919522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631308631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113025 + ... + 118478.

It is an arithmetic number, because the mean of its divisors is an integer number (59033520).

Almost surely, 2^631308681 is an apocalyptic number.

It is an amenable number.

631308681 is a deficient number, since it is larger than the sum of its proper divisors (313227639).

631308681 is a wasteful number, since it uses less digits than its factorization.

631308681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231613 (or 231607 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 631308681 is about 25125.8568212111. The cubic root of 631308681 is about 857.8550662326.

The spelling of 631308681 in words is "six hundred thirty-one million, three hundred eight thousand, six hundred eighty-one".