31000131 has 16 divisors (see below), whose sum is σ = 46032000. Its totient is φ = 20619144.

The previous prime is 31000127. The next prime is 31000157. The reversal of 31000131 is 13100013.

It is not a de Polignac number, because 31000131 - 2² = 31000127 is a prime.

It is a super-2 number, since 2×31000131² = 1922016244034322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (31000531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13720 + ... + 15818.

It is an arithmetic number, because the mean of its divisors is an integer number (2877000).

Almost surely, 2^31000131 is an apocalyptic number.

31000131 is a deficient number, since it is larger than the sum of its proper divisors (15031869).

31000131 is a wasteful number, since it uses less digits than its factorization.

31000131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655 (or 2649 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 9.

The square root of 31000131 is about 5567.7761269649. The cubic root of 31000131 is about 314.1385077341.

Adding to 31000131 its reverse (13100013), we get a palindrome (44100144).

The spelling of 31000131 in words is "thirty-one million, one hundred thirty-one", and thus it is an aban number.