123255513 has 10 divisors (see below), whose sum is σ = 184122554. Its totient is φ = 82170288.

The previous prime is 123255499. The next prime is 123255521. The reversal of 123255513 is 315552321.

It is a happy number.

123255513 is a `hidden beast` number, since 123 + 25 + 5 + 513 = 666.

It can be written as a sum of positive squares in only one way, i.e., 122146704 + 1108809 = 11052^2 + 1053^2 .

It is not a de Polignac number, because 123255513 - 2⁹ = 123255001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123255523) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 760756 + ... + 760917.

Almost surely, 2^123255513 is an apocalyptic number.

It is an amenable number.

123255513 is a deficient number, since it is larger than the sum of its proper divisors (60867041).

123255513 is an equidigital number, since it uses as much as digits as its factorization.

123255513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521685 (or 1521676 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 123255513 is about 11102.0499458433. The cubic root of 123255513 is about 497.6631122605.

The spelling of 123255513 in words is "one hundred twenty-three million, two hundred fifty-five thousand, five hundred thirteen".