123123111321311 has 2 divisors, whose sum is σ = 123123111321312. Its totient is φ = 123123111321310.

The previous prime is 123123111321281. The next prime is 123123111321389. The reversal of 123123111321311 is 113123111321321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123123111321311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123123111321391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61561555660655 + 61561555660656.

It is an arithmetic number, because the mean of its divisors is an integer number (61561555660656).

Almost surely, 2^{123123111321311} is an apocalyptic number.

123123111321311 is a deficient number, since it is larger than the sum of its proper divisors (1).

123123111321311 is an equidigital number, since it uses as much as digits as its factorization.

123123111321311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 26.

Adding to 123123111321311 its reverse (113123111321321), we get a palindrome (236246222642632).

The spelling of 123123111321311 in words is "one hundred twenty-three trillion, one hundred twenty-three billion, one hundred eleven million, three hundred twenty-one thousand, three hundred eleven".