12031131 has 16 divisors (see below), whose sum is σ = 18925568. Its totient is φ = 6652800.

The previous prime is 12031111. The next prime is 12031133. The reversal of 12031131 is 13113021.

It is not a de Polignac number, because 12031131 - 2⁷ = 12031003 is a prime.

It is a super-2 number, since 2×12031131² = 289496226278322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031133) 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, 8590 + ... + 9891.

It is an arithmetic number, because the mean of its divisors is an integer number (1182848).

Almost surely, 2^12031131 is an apocalyptic number.

12031131 is a deficient number, since it is larger than the sum of its proper divisors (6894437).

12031131 is a wasteful number, since it uses less digits than its factorization.

12031131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18522.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 12031131 is about 3468.5920774862. The cubic root of 12031131 is about 229.1406558835.

Adding to 12031131 its reverse (13113021), we get a palindrome (25144152).

The spelling of 12031131 in words is "twelve million, thirty-one thousand, one hundred thirty-one".