31897602801 has 27 divisors (see below), whose sum is σ = 47382670881. Its totient is φ = 20677477824.

The previous prime is 31897602791. The next prime is 31897602871. The reversal of 31897602801 is 10820679813.

The square root of 31897602801 is 178599.

It is a perfect power (a square), and thus also a powerful number.

31897602801 is a `hidden beast` number, since 31 + 8 + 9 + 7 + 602 + 8 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 25095312225 + 6802290576 = 158415^2 + 82476^2 .

It is not a de Polignac number, because 31897602801 - 2⁵ = 31897602769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31897602871) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19823685 + ... + 19825293.

Almost surely, 2^31897602801 is an apocalyptic number.

31897602801 is the 178599-th square number.

31897602801 is the 89300-th centered octagonal number.

It is an amenable number.

31897602801 is a deficient number, since it is larger than the sum of its proper divisors (15485068080).

31897602801 is an frugal number, since it uses more digits than its factorization.

31897602801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 31897602801 in words is "thirty-one billion, eight hundred ninety-seven million, six hundred two thousand, eight hundred one".