123918596488129 has 3 divisors (see below), whose sum is σ = 123918607620003. Its totient is φ = 123918585356256.

The previous prime is 123918596487937. The next prime is 123918596488151. The reversal of 123918596488129 is 921884695819321.

The square root of 123918596488129 is 11131873.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1558540012225 + 122360056475904 = 1248415^2 + 11061648^2 .

It is not a de Polignac number, because 123918596488129 - 2²³ = 123918588099521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123918596485129) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5565937 + ... + 16697809.

It is an arithmetic number, because the mean of its divisors is an integer number (41306202540001).

Almost surely, 2^{123918596488129} is an apocalyptic number.

123918596488129 is the 11131873-rd square number.

123918596488129 is the 5565937-th centered octagonal number.

It is an amenable number.

123918596488129 is a deficient number, since it is larger than the sum of its proper divisors (11131874).

123918596488129 is an frugal number, since it uses more digits than its factorization.

123918596488129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22263746 (or 11131873 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 76.

The spelling of 123918596488129 in words is "one hundred twenty-three trillion, nine hundred eighteen billion, five hundred ninety-six million, four hundred eighty-eight thousand, one hundred twenty-nine".