31870213133 has 4 divisors (see below), whose sum is σ = 34767505248. Its totient is φ = 28972921020.

The previous prime is 31870213129. The next prime is 31870213147. The reversal of 31870213133 is 33131207813.

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 31870213133 - 2² = 31870213129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31870213133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31870213933) 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, 1448646041 + ... + 1448646062.

It is an arithmetic number, because the mean of its divisors is an integer number (8691876312).

Almost surely, 2^31870213133 is an apocalyptic number.

It is an amenable number.

31870213133 is a deficient number, since it is larger than the sum of its proper divisors (2897292115).

31870213133 is a wasteful number, since it uses less digits than its factorization.

31870213133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897292114.

The product of its (nonzero) digits is 9072, while the sum is 32.

The spelling of 31870213133 in words is "thirty-one billion, eight hundred seventy million, two hundred thirteen thousand, one hundred thirty-three".