123489557 has 2 divisors, whose sum is σ = 123489558. Its totient is φ = 123489556.

The previous prime is 123489533. The next prime is 123489563. The reversal of 123489557 is 755984321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120253156 + 3236401 = 10966^2 + 1799^2 .

It is a cyclic number.

It is not a de Polignac number, because 123489557 - 2²⁶ = 56380693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123489517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61744778 + 61744779.

It is an arithmetic number, because the mean of its divisors is an integer number (61744779).

Almost surely, 2^123489557 is an apocalyptic number.

It is an amenable number.

123489557 is a deficient number, since it is larger than the sum of its proper divisors (1).

123489557 is an equidigital number, since it uses as much as digits as its factorization.

123489557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 44.

The square root of 123489557 is about 11112.5855227305. The cubic root of 123489557 is about 497.9779093226.

The spelling of 123489557 in words is "one hundred twenty-three million, four hundred eighty-nine thousand, five hundred fifty-seven".