3131213230331 has 4 divisors (see below), whose sum is σ = 3134498869512. Its totient is φ = 3127927591152.

The previous prime is 3131213230273. The next prime is 3131213230337. The reversal of 3131213230331 is 1330323121313.

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 3131213230331 - 2⁶ = 3131213230267 is a prime.

It is a super-2 number, since 2×3131213230331² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3131213230331.

It is not an unprimeable number, because it can be changed into a prime (3131213230337) 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, 1642818161 + ... + 1642820066.

It is an arithmetic number, because the mean of its divisors is an integer number (783624717378).

Almost surely, 2^{3131213230331} is an apocalyptic number.

3131213230331 is a deficient number, since it is larger than the sum of its proper divisors (3285639181).

3131213230331 is an equidigital number, since it uses as much as digits as its factorization.

3131213230331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285639180.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 3131213230331 its reverse (1330323121313), we get a palindrome (4461536351644).

The spelling of 3131213230331 in words is "three trillion, one hundred thirty-one billion, two hundred thirteen million, two hundred thirty thousand, three hundred thirty-one".