31112132331 has 16 divisors (see below), whose sum is σ = 49904172800. Its totient is φ = 16842657888.

The previous prime is 31112132329. The next prime is 31112132341. The reversal of 31112132331 is 13323121113.

It is a happy number.

It is not a de Polignac number, because 31112132331 - 2¹ = 31112132329 is a prime.

It is a super-2 number, since 2×31112132331² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112132298 and 31112132307.

It is not an unprimeable number, because it can be changed into a prime (31112132341) 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, 38987236 + ... + 38988033.

It is an arithmetic number, because the mean of its divisors is an integer number (3119010800).

Almost surely, 2^31112132331 is an apocalyptic number.

31112132331 is a deficient number, since it is larger than the sum of its proper divisors (18792040469).

31112132331 is a wasteful number, since it uses less digits than its factorization.

31112132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77975298.

The product of its digits is 324, while the sum is 21.

Adding to 31112132331 its reverse (13323121113), we get a palindrome (44435253444).

The spelling of 31112132331 in words is "thirty-one billion, one hundred twelve million, one hundred thirty-two thousand, three hundred thirty-one".