31115520213 has 4 divisors (see below), whose sum is σ = 41487360288. Its totient is φ = 20743680140.

The previous prime is 31115520203. The next prime is 31115520277. The reversal of 31115520213 is 31202551113.

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 31115520213 - 2⁴ = 31115520197 is a prime.

It is a super-2 number, since 2×31115520213² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31115520203) 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, 5185920033 + ... + 5185920038.

It is an arithmetic number, because the mean of its divisors is an integer number (10371840072).

Almost surely, 2^31115520213 is an apocalyptic number.

It is an amenable number.

31115520213 is a deficient number, since it is larger than the sum of its proper divisors (10371840075).

31115520213 is a wasteful number, since it uses less digits than its factorization.

31115520213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10371840074.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 31115520213 in words is "thirty-one billion, one hundred fifteen million, five hundred twenty thousand, two hundred thirteen".