313131121253031 has 4 divisors (see below), whose sum is σ = 417508161670712. Its totient is φ = 208754080835352.

The previous prime is 313131121253021. The next prime is 313131121253053. The reversal of 313131121253031 is 130352121131313.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 313131121253031 - 2⁶ = 313131121252967 is a prime.

It is a super-2 number, since 2×313131121253031² (a number of 30 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 313131121253031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313131121253021) 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, 52188520208836 + ... + 52188520208841.

It is an arithmetic number, because the mean of its divisors is an integer number (104377040417678).

Almost surely, 2^{313131121253031} is an apocalyptic number.

313131121253031 is a deficient number, since it is larger than the sum of its proper divisors (104377040417681).

313131121253031 is a wasteful number, since it uses less digits than its factorization.

313131121253031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104377040417680.

The product of its (nonzero) digits is 4860, while the sum is 30.

Adding to 313131121253031 its reverse (130352121131313), we get a palindrome (443483242384344).

The spelling of 313131121253031 in words is "three hundred thirteen trillion, one hundred thirty-one billion, one hundred twenty-one million, two hundred fifty-three thousand, thirty-one".