31355884613 has 4 divisors (see below), whose sum is σ = 32719183968. Its totient is φ = 29992585260.

The previous prime is 31355884601. The next prime is 31355884627. The reversal of 31355884613 is 31648855313.

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 a cyclic number.

It is not a de Polignac number, because 31355884613 - 2⁴ = 31355884597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31355884633) 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, 681649643 + ... + 681649688.

It is an arithmetic number, because the mean of its divisors is an integer number (8179795992).

Almost surely, 2^31355884613 is an apocalyptic number.

It is an amenable number.

31355884613 is a deficient number, since it is larger than the sum of its proper divisors (1363299355).

31355884613 is a wasteful number, since it uses less digits than its factorization.

31355884613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363299354.

The product of its digits is 1036800, while the sum is 47.

The spelling of 31355884613 in words is "thirty-one billion, three hundred fifty-five million, eight hundred eighty-four thousand, six hundred thirteen".