31311131323223 has 2 divisors, whose sum is σ = 31311131323224. Its totient is φ = 31311131323222.

The previous prime is 31311131323169. The next prime is 31311131323247. The reversal of 31311131323223 is 32232313111313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31311131323223 - 2²⁸ = 31310862887767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311131323123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655565661611 + 15655565661612.

It is an arithmetic number, because the mean of its divisors is an integer number (15655565661612).

Almost surely, 2^{31311131323223} is an apocalyptic number.

31311131323223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311131323223 is an equidigital number, since it uses as much as digits as its factorization.

31311131323223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 29.

Adding to 31311131323223 its reverse (32232313111313), we get a palindrome (63543444434536).

The spelling of 31311131323223 in words is "thirty-one trillion, three hundred eleven billion, one hundred thirty-one million, three hundred twenty-three thousand, two hundred twenty-three".