31897272263 has 4 divisors (see below), whose sum is σ = 31953928728. Its totient is φ = 31840615800.

The previous prime is 31897272221. The next prime is 31897272271. The reversal of 31897272263 is 36227279813.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31897272263 - 2¹⁰ = 31897271239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31897272293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28327388 + ... + 28328513.

It is an arithmetic number, because the mean of its divisors is an integer number (7988482182).

Almost surely, 2^31897272263 is an apocalyptic number.

31897272263 is a deficient number, since it is larger than the sum of its proper divisors (56656465).

31897272263 is an equidigital number, since it uses as much as digits as its factorization.

31897272263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56656464.

The product of its digits is 1524096, while the sum is 50.

The spelling of 31897272263 in words is "thirty-one billion, eight hundred ninety-seven million, two hundred seventy-two thousand, two hundred sixty-three".