12561530 has 32 divisors (see below), whose sum is σ = 23339664. Its totient is φ = 4865536.

The previous prime is 12561529. The next prime is 12561551. The reversal of 12561530 is 3516521.

It can be written as a sum of positive squares in 8 ways, for example, as 10106041 + 2455489 = 3179^2 + 1567^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12561496 and 12561505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72524 + ... + 72696.

Almost surely, 2^12561530 is an apocalyptic number.

12561530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12561530 is a deficient number, since it is larger than the sum of its proper divisors (10778134).

12561530 is a wasteful number, since it uses less digits than its factorization.

12561530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 12561530 is about 3544.2248799984. The cubic root of 12561530 is about 232.4596145216.

The spelling of 12561530 in words is "twelve million, five hundred sixty-one thousand, five hundred thirty".