31004131 has 4 divisors (see below), whose sum is σ = 31029264. Its totient is φ = 30979000.

The previous prime is 31004119. The next prime is 31004147. The reversal of 31004131 is 13140013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31004131 - 2⁷ = 31004003 is a prime.

It is a super-2 number, since 2×31004131² = 1922512278130322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31004101) 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, 10615 + ... + 13216.

It is an arithmetic number, because the mean of its divisors is an integer number (7757316).

Almost surely, 2^31004131 is an apocalyptic number.

31004131 is a deficient number, since it is larger than the sum of its proper divisors (25133).

31004131 is a wasteful number, since it uses less digits than its factorization.

31004131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25132.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31004131 is about 5568.1353252233. The cubic root of 31004131 is about 314.1520184296.

Adding to 31004131 its reverse (13140013), we get a palindrome (44144144).

The spelling of 31004131 in words is "thirty-one million, four thousand, one hundred thirty-one".