31989017436 has 48 divisors (see below), whose sum is σ = 79054569216. Its totient is φ = 10032865024.

The previous prime is 31989017413. The next prime is 31989017479. The reversal of 31989017436 is 63471098913.

It is a super-3 number, since 3×31989017436³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 747655 + ... + 789281.

It is an arithmetic number, because the mean of its divisors is an integer number (1646970192).

Almost surely, 2^31989017436 is an apocalyptic number.

It is an amenable number.

31989017436 is an abundant number, since it is smaller than the sum of its proper divisors (47065551780).

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

31989017436 is a wasteful number, since it uses less digits than its factorization.

31989017436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45418 (or 45416 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 31989017436 in words is "thirty-one billion, nine hundred eighty-nine million, seventeen thousand, four hundred thirty-six".