31310320131 has 6 divisors (see below), whose sum is σ = 45226017980. Its totient is φ = 20873546748.

The previous prime is 31310320123. The next prime is 31310320147. The reversal of 31310320131 is 13102301313.

It is a happy number.

31310320131 is a `hidden beast` number, since 3 + 1 + 310 + 320 + 1 + 31 = 666.

It is not a de Polignac number, because 31310320131 - 2³ = 31310320123 is a prime.

It is a super-2 number, since 2×31310320131² (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 (31310320631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1739462221 + ... + 1739462238.

Almost surely, 2^31310320131 is an apocalyptic number.

31310320131 is a deficient number, since it is larger than the sum of its proper divisors (13915697849).

31310320131 is a wasteful number, since it uses less digits than its factorization.

31310320131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3478924465 (or 3478924462 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31310320131 its reverse (13102301313), we get a palindrome (44412621444).

The spelling of 31310320131 in words is "thirty-one billion, three hundred ten million, three hundred twenty thousand, one hundred thirty-one".