313031221231 has 12 divisors (see below), whose sum is σ = 327700212840. Its totient is φ = 298993679600.

The previous prime is 313031221219. The next prime is 313031221271. The reversal of 313031221231 is 132122130313.

It is a de Polignac number, because none of the positive numbers 2^k-313031221231 is a prime.

It is a super-4 number, since 4×313031221231⁴ (a number of 47 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313031221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51241 + ... + 792898.

It is an arithmetic number, because the mean of its divisors is an integer number (27308351070).

Almost surely, 2^313031221231 is an apocalyptic number.

313031221231 is a deficient number, since it is larger than the sum of its proper divisors (14668991609).

313031221231 is an equidigital number, since it uses as much as digits as its factorization.

313031221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844886 (or 844863 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 313031221231 its reverse (132122130313), we get a palindrome (445153351544).

The spelling of 313031221231 in words is "three hundred thirteen billion, thirty-one million, two hundred twenty-one thousand, two hundred thirty-one".