31631240655 has 96 divisors (see below), whose sum is σ = 67146153984. Its totient is φ = 13445250048.

The previous prime is 31631240617. The next prime is 31631240699. The reversal of 31631240655 is 55604213613.

It is not a de Polignac number, because 31631240655 - 2⁶ = 31631240591 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 408882 + ... + 480048.

It is an arithmetic number, because the mean of its divisors is an integer number (699439104).

Almost surely, 2^31631240655 is an apocalyptic number.

31631240655 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31631240655 is an abundant number, since it is smaller than the sum of its proper divisors (35514913329).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31631240655 is a wasteful number, since it uses less digits than its factorization.

31631240655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71285 (or 71282 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 31631240655 in words is "thirty-one billion, six hundred thirty-one million, two hundred forty thousand, six hundred fifty-five".