123121841975659 has 2 divisors, whose sum is σ = 123121841975660. Its totient is φ = 123121841975658.

The previous prime is 123121841975647. The next prime is 123121841975723. The reversal of 123121841975659 is 956579148121321.

It is an a-pointer prime, because the next prime (123121841975723) can be obtained adding 123121841975659 to its sum of digits (64).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123121841975659 - 2²⁷ = 123121707757931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123121841975659.

It is not a weakly prime, because it can be changed into another prime (123121841972659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560920987829 + 61560920987830.

It is an arithmetic number, because the mean of its divisors is an integer number (61560920987830).

Almost surely, 2^{123121841975659} is an apocalyptic number.

123121841975659 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121841975659 is an equidigital number, since it uses as much as digits as its factorization.

123121841975659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32659200, while the sum is 64.

The spelling of 123121841975659 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, eight hundred forty-one million, nine hundred seventy-five thousand, six hundred fifty-nine".