31113120331131 has 4 divisors (see below), whose sum is σ = 41484160441512. Its totient is φ = 20742080220752.

The previous prime is 31113120331093. The next prime is 31113120331157. The reversal of 31113120331131 is 13113302131113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31113120331131 - 2⁶ = 31113120331067 is a prime.

It is a super-2 number, since 2×31113120331131² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31113120331031) 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, 5185520055186 + ... + 5185520055191.

It is an arithmetic number, because the mean of its divisors is an integer number (10371040110378).

Almost surely, 2^{31113120331131} is an apocalyptic number.

31113120331131 is a deficient number, since it is larger than the sum of its proper divisors (10371040110381).

31113120331131 is a wasteful number, since it uses less digits than its factorization.

31113120331131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10371040110380.

The product of its (nonzero) digits is 486, while the sum is 24.

Adding to 31113120331131 its reverse (13113302131113), we get a palindrome (44226422462244).

The spelling of 31113120331131 in words is "thirty-one trillion, one hundred thirteen billion, one hundred twenty million, three hundred thirty-one thousand, one hundred thirty-one".