31420312131 has 16 divisors (see below), whose sum is σ = 46672083360. Its totient is φ = 18668832000.

The previous prime is 31420312123. The next prime is 31420312159. The reversal of 31420312131 is 13121302413.

It is not a de Polignac number, because 31420312131 - 2³ = 31420312123 is a prime.

It is a super-2 number, since 2×31420312131² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31420312098 and 31420312107.

It is not an unprimeable number, because it can be changed into a prime (31420312171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13889370 + ... + 13891631.

It is an arithmetic number, because the mean of its divisors is an integer number (2917005210).

Almost surely, 2^31420312131 is an apocalyptic number.

31420312131 is a deficient number, since it is larger than the sum of its proper divisors (15251771229).

31420312131 is a wasteful number, since it uses less digits than its factorization.

31420312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27781046.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31420312131 its reverse (13121302413), we get a palindrome (44541614544).

The spelling of 31420312131 in words is "thirty-one billion, four hundred twenty million, three hundred twelve thousand, one hundred thirty-one".