123557407231 has 2 divisors, whose sum is σ = 123557407232. Its totient is φ = 123557407230.

The previous prime is 123557407223. The next prime is 123557407241. The reversal of 123557407231 is 132704755321.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (132704755321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123557407231 - 2³ = 123557407223 is a prime.

It is a super-2 number, since 2×123557407231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123557407201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61778703615 + 61778703616.

It is an arithmetic number, because the mean of its divisors is an integer number (61778703616).

Almost surely, 2^123557407231 is an apocalyptic number.

123557407231 is a deficient number, since it is larger than the sum of its proper divisors (1).

123557407231 is an equidigital number, since it uses as much as digits as its factorization.

123557407231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 40.

The spelling of 123557407231 in words is "one hundred twenty-three billion, five hundred fifty-seven million, four hundred seven thousand, two hundred thirty-one".