123013311991 has 2 divisors, whose sum is σ = 123013311992. Its totient is φ = 123013311990.

The previous prime is 123013311961. The next prime is 123013312031. The reversal of 123013311991 is 199113310321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123013311991 - 2²¹ = 123011214839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123013311961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61506655995 + 61506655996.

It is an arithmetic number, because the mean of its divisors is an integer number (61506655996).

Almost surely, 2^123013311991 is an apocalyptic number.

123013311991 is a deficient number, since it is larger than the sum of its proper divisors (1).

123013311991 is an equidigital number, since it uses as much as digits as its factorization.

123013311991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The spelling of 123013311991 in words is "one hundred twenty-three billion, thirteen million, three hundred eleven thousand, nine hundred ninety-one".