313131221323 has 2 divisors, whose sum is σ = 313131221324. Its totient is φ = 313131221322.

The previous prime is 313131221269. The next prime is 313131221327. The reversal of 313131221323 is 323122131313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 313131221323 - 2²¹ = 313129124171 is a prime.

It is not a weakly prime, because it can be changed into another prime (313131221327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156565610661 + 156565610662.

It is an arithmetic number, because the mean of its divisors is an integer number (156565610662).

Almost surely, 2^313131221323 is an apocalyptic number.

313131221323 is a deficient number, since it is larger than the sum of its proper divisors (1).

313131221323 is an equidigital number, since it uses as much as digits as its factorization.

313131221323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 25.

Adding to 313131221323 its reverse (323122131313), we get a palindrome (636253352636).

The spelling of 313131221323 in words is "three hundred thirteen billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-three".