123591457 has 6 divisors (see below), whose sum is σ = 135848594. Its totient is φ = 112355760.

The previous prime is 123591437. The next prime is 123591463. The reversal of 123591457 is 754195321.

It can be written as a sum of positive squares in only one way, i.e., 91374481 + 32216976 = 9559^2 + 5676^2 .

It is not a de Polignac number, because 123591457 - 2⁷ = 123591329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123591407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510588 + ... + 510829.

Almost surely, 2^123591457 is an apocalyptic number.

It is an amenable number.

123591457 is a deficient number, since it is larger than the sum of its proper divisors (12257137).

123591457 is a wasteful number, since it uses less digits than its factorization.

123591457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021439 (or 1021428 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 123591457 is about 11117.1694688891. The cubic root of 123591457 is about 498.1148439728.

The spelling of 123591457 in words is "one hundred twenty-three million, five hundred ninety-one thousand, four hundred fifty-seven".