31231000131 has 32 divisors (see below), whose sum is σ = 45468902400. Its totient is φ = 18992413440.

The previous prime is 31231000117. The next prime is 31231000139. The reversal of 31231000131 is 13100013213.

It is not a de Polignac number, because 31231000131 - 2²¹ = 31228902979 is a prime.

It is a super-2 number, since 2×31231000131² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31231000131.

It is not an unprimeable number, because it can be changed into a prime (31231000139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 580911 + ... + 632391.

It is an arithmetic number, because the mean of its divisors is an integer number (1420903200).

Almost surely, 2^31231000131 is an apocalyptic number.

31231000131 is a deficient number, since it is larger than the sum of its proper divisors (14237902269).

31231000131 is a wasteful number, since it uses less digits than its factorization.

31231000131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51899.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31231000131 its reverse (13100013213), we get a palindrome (44331013344).

The spelling of 31231000131 in words is "thirty-one billion, two hundred thirty-one million, one hundred thirty-one", and thus it is an aban number.