31131941 has 4 divisors (see below), whose sum is σ = 31169292. Its totient is φ = 31094592.

The previous prime is 31131929. The next prime is 31131943. The reversal of 31131941 is 14913113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14913113 = 1931 ⋅7723.

It can be written as a sum of positive squares in 2 ways, for example, as 18671041 + 12460900 = 4321^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 31131941 - 2²² = 26937637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131943) 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, 17396 + ... + 19101.

It is an arithmetic number, because the mean of its divisors is an integer number (7792323).

Almost surely, 2^31131941 is an apocalyptic number.

It is an amenable number.

31131941 is a deficient number, since it is larger than the sum of its proper divisors (37351).

31131941 is an equidigital number, since it uses as much as digits as its factorization.

31131941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37350.

The product of its digits is 324, while the sum is 23.

The square root of 31131941 is about 5579.6004337228. The cubic root of 31131941 is about 314.5831085341.

The spelling of 31131941 in words is "thirty-one million, one hundred thirty-one thousand, nine hundred forty-one".