123240011591 has 2 divisors, whose sum is σ = 123240011592. Its totient is φ = 123240011590.

The previous prime is 123240011569. The next prime is 123240011593. The reversal of 123240011591 is 195110042321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123240011591 - 2³⁴ = 106060142407 is a prime.

Together with 123240011593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123240011593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61620005795 + 61620005796.

It is an arithmetic number, because the mean of its divisors is an integer number (61620005796).

Almost surely, 2^123240011591 is an apocalyptic number.

123240011591 is a deficient number, since it is larger than the sum of its proper divisors (1).

123240011591 is an equidigital number, since it uses as much as digits as its factorization.

123240011591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 123240011591 in words is "one hundred twenty-three billion, two hundred forty million, eleven thousand, five hundred ninety-one".