31000232131 has 4 divisors (see below), whose sum is σ = 33818435064. Its totient is φ = 28182029200.

The previous prime is 31000232113. The next prime is 31000232161. The reversal of 31000232131 is 13123200013.

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 31000232131 - 2¹³ = 31000223939 is a prime.

It is a super-2 number, since 2×31000232131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31000232111) 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, 1409101450 + ... + 1409101471.

It is an arithmetic number, because the mean of its divisors is an integer number (8454608766).

Almost surely, 2^31000232131 is an apocalyptic number.

31000232131 is a deficient number, since it is larger than the sum of its proper divisors (2818202933).

31000232131 is a wasteful number, since it uses less digits than its factorization.

31000232131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818202932.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31000232131 its reverse (13123200013), we get a palindrome (44123432144).

The spelling of 31000232131 in words is "thirty-one billion, two hundred thirty-two thousand, one hundred thirty-one".