123975557 has 4 divisors (see below), whose sum is σ = 124288236. Its totient is φ = 123662880.

The previous prime is 123975539. The next prime is 123975559. The reversal of 123975557 is 755579321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755579321 = 7 ⋅107939903.

It can be written as a sum of positive squares in 2 ways, for example, as 89094721 + 34880836 = 9439^2 + 5906^2 .

It is a cyclic number.

It is not a de Polignac number, because 123975557 - 2¹⁰ = 123974533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123975559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155744 + ... + 156537.

It is an arithmetic number, because the mean of its divisors is an integer number (31072059).

Almost surely, 2^123975557 is an apocalyptic number.

It is an amenable number.

123975557 is a deficient number, since it is larger than the sum of its proper divisors (312679).

123975557 is an equidigital number, since it uses as much as digits as its factorization.

123975557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312678.

The product of its digits is 330750, while the sum is 44.

The square root of 123975557 is about 11134.4311484691. The cubic root of 123975557 is about 498.6303274201.

The spelling of 123975557 in words is "one hundred twenty-three million, nine hundred seventy-five thousand, five hundred fifty-seven".