12561507 has 16 divisors (see below), whose sum is σ = 21268480. Its totient is φ = 7177896.

The previous prime is 12561491. The next prime is 12561509. The reversal of 12561507 is 70516521.

12561507 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12561507 - 2⁴ = 12561491 is a prime.

It is a super-2 number, since 2×12561507² = 315582916222098, which contains 22 as substring.

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 (12561509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33043 + ... + 33420.

It is an arithmetic number, because the mean of its divisors is an integer number (1329280).

Almost surely, 2^12561507 is an apocalyptic number.

12561507 is a deficient number, since it is larger than the sum of its proper divisors (8706973).

12561507 is an equidigital number, since it uses as much as digits as its factorization.

12561507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66479 (or 66473 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 12561507 is about 3544.2216352819. The cubic root of 12561507 is about 232.4594726447.

The spelling of 12561507 in words is "twelve million, five hundred sixty-one thousand, five hundred seven".