31491063900 has 72 divisors (see below), whose sum is σ = 101237947440. Its totient is φ = 8397616320.

The previous prime is 31491063841. The next prime is 31491063911. The reversal of 31491063900 is 936019413.

31491063900 is a `hidden beast` number, since 3 + 1 + 4 + 9 + 10 + 639 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5828979 + ... + 5834378.

Almost surely, 2^31491063900 is an apocalyptic number.

31491063900 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31491063900 is an abundant number, since it is smaller than the sum of its proper divisors (69746883540).

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

31491063900 is a wasteful number, since it uses less digits than its factorization.

31491063900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11663380 (or 11663367 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The spelling of 31491063900 in words is "thirty-one billion, four hundred ninety-one million, sixty-three thousand, nine hundred".