31011232131 has 32 divisors (see below), whose sum is σ = 50158137600. Its totient is φ = 18780071040.

The previous prime is 31011232081. The next prime is 31011232141. The reversal of 31011232131 is 13123211013.

31011232131 is a `hidden beast` number, since 310 + 1 + 1 + 2 + 321 + 31 = 666.

It is not a de Polignac number, because 31011232131 - 2¹⁵ = 31011199363 is a prime.

It is a super-2 number, since 2×31011232131² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31011232141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 348235 + ... + 428123.

It is an arithmetic number, because the mean of its divisors is an integer number (1567441800).

Almost surely, 2^31011232131 is an apocalyptic number.

31011232131 is a deficient number, since it is larger than the sum of its proper divisors (19146905469).

31011232131 is a wasteful number, since it uses less digits than its factorization.

31011232131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81216 (or 81210 counting only the distinct ones).

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

Adding to 31011232131 its reverse (13123211013), we get a palindrome (44134443144).

It can be divided in two parts, 310112 and 32131, that added together give a palindrome (342243).

The spelling of 31011232131 in words is "thirty-one billion, eleven million, two hundred thirty-two thousand, one hundred thirty-one".