31984557393 has 4 divisors (see below), whose sum is σ = 42646076528. Its totient is φ = 21323038260.

The previous prime is 31984557373. The next prime is 31984557403. The reversal of 31984557393 is 39375548913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31984557393 - 2¹² = 31984553297 is a prime.

It is a super-2 number, since 2×31984557393² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31984557313) 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, 5330759563 + ... + 5330759568.

It is an arithmetic number, because the mean of its divisors is an integer number (10661519132).

Almost surely, 2^31984557393 is an apocalyptic number.

It is an amenable number.

31984557393 is a deficient number, since it is larger than the sum of its proper divisors (10661519135).

31984557393 is a wasteful number, since it uses less digits than its factorization.

31984557393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661519134.

The product of its digits is 12247200, while the sum is 57.

The spelling of 31984557393 in words is "thirty-one billion, nine hundred eighty-four million, five hundred fifty-seven thousand, three hundred ninety-three".