31497156900 has 216 divisors, whose sum is σ = 113370348000. Its totient is φ = 7233753600.

The previous prime is 31497156883. The next prime is 31497156983. The reversal of 31497156900 is 965179413.

31497156900 is a `hidden beast` number, since 3 + 1 + 497 + 156 + 9 + 0 + 0 = 666.

It is a super-2 number, since 2×31497156900² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 104376 + ... + 271824.

Almost surely, 2^31497156900 is an apocalyptic number.

31497156900 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31497156900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56685174000).

31497156900 is an abundant number, since it is smaller than the sum of its proper divisors (81873191100).

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

31497156900 is a wasteful number, since it uses less digits than its factorization.

31497156900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167499 (or 167489 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 31497156900 in words is "thirty-one billion, four hundred ninety-seven million, one hundred fifty-six thousand, nine hundred".