31132011231 has 16 divisors (see below), whose sum is σ = 46639720800. Its totient is φ = 20521473984.

The previous prime is 31132011217. The next prime is 31132011263. The reversal of 31132011231 is 13211023113.

31132011231 is a `hidden beast` number, since 311 + 320 + 1 + 1 + 2 + 31 = 666.

It is not a de Polignac number, because 31132011231 - 2¹⁸ = 31131749087 is a prime.

It is a super-2 number, since 2×31132011231² (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 (31132012231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6475336 + ... + 6480141.

It is an arithmetic number, because the mean of its divisors is an integer number (2914982550).

Almost surely, 2^31132011231 is an apocalyptic number.

31132011231 is a deficient number, since it is larger than the sum of its proper divisors (15507709569).

31132011231 is a wasteful number, since it uses less digits than its factorization.

31132011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12955575 (or 12955569 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31132011231 its reverse (13211023113), we get a palindrome (44343034344).

The spelling of 31132011231 in words is "thirty-one billion, one hundred thirty-two million, eleven thousand, two hundred thirty-one".