313131221999 has 16 divisors (see below), whose sum is σ = 332971430400. Its totient is φ = 293449584000.

The previous prime is 313131221941. The next prime is 313131222007. The reversal of 313131221999 is 999122131313.

It is a cyclic number.

It is not a de Polignac number, because 313131221999 - 2³² = 308836254703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313131221699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17481482 + ... + 17499384.

It is an arithmetic number, because the mean of its divisors is an integer number (20810714400).

Almost surely, 2^313131221999 is an apocalyptic number.

313131221999 is a deficient number, since it is larger than the sum of its proper divisors (19840208401).

313131221999 is a wasteful number, since it uses less digits than its factorization.

313131221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22270.

The product of its digits is 78732, while the sum is 44.

The spelling of 313131221999 in words is "three hundred thirteen billion, one hundred thirty-one million, two hundred twenty-one thousand, nine hundred ninety-nine".