12513530 has 16 divisors (see below), whose sum is σ = 23849640. Its totient is φ = 4710912.

The previous prime is 12513517. The next prime is 12513563. The reversal of 12513530 is 3531521.

It can be written as a sum of positive squares in 4 ways, for example, as 7946761 + 4566769 = 2819^2 + 2137^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36635 + ... + 36974.

Almost surely, 2^12513530 is an apocalyptic number.

12513530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12513530 is a deficient number, since it is larger than the sum of its proper divisors (11336110).

12513530 is a wasteful number, since it uses less digits than its factorization.

12513530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73633.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 12513530 is about 3537.4468193882. The cubic root of 12513530 is about 232.1631457500.

Subtracting from 12513530 its reverse (3531521), we obtain a square (8982009 = 2997²).

The spelling of 12513530 in words is "twelve million, five hundred thirteen thousand, five hundred thirty".