123012111091 has 2 divisors, whose sum is σ = 123012111092. Its totient is φ = 123012111090.

The previous prime is 123012111023. The next prime is 123012111107. The reversal of 123012111091 is 190111210321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123012111091 - 2⁹ = 123012110579 is a prime.

It is not a weakly prime, because it can be changed into another prime (123012111791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61506055545 + 61506055546.

It is an arithmetic number, because the mean of its divisors is an integer number (61506055546).

Almost surely, 2^123012111091 is an apocalyptic number.

123012111091 is a deficient number, since it is larger than the sum of its proper divisors (1).

123012111091 is an equidigital number, since it uses as much as digits as its factorization.

123012111091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 22.

The spelling of 123012111091 in words is "one hundred twenty-three billion, twelve million, one hundred eleven thousand, ninety-one".