123240325991 has 2 divisors, whose sum is σ = 123240325992. Its totient is φ = 123240325990.

The previous prime is 123240325981. The next prime is 123240326003. The reversal of 123240325991 is 199523042321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123240325991 - 2¹⁸ = 123240063847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123240325921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61620162995 + 61620162996.

It is an arithmetic number, because the mean of its divisors is an integer number (61620162996).

Almost surely, 2^123240325991 is an apocalyptic number.

123240325991 is a deficient number, since it is larger than the sum of its proper divisors (1).

123240325991 is an equidigital number, since it uses as much as digits as its factorization.

123240325991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 123240325991 in words is "one hundred twenty-three billion, two hundred forty million, three hundred twenty-five thousand, nine hundred ninety-one".