12561039 has 6 divisors (see below), whose sum is σ = 18143736. Its totient is φ = 8374020.

The previous prime is 12561023. The next prime is 12561061. The reversal of 12561039 is 93016521.

12561039 is a `hidden beast` number, since 12 + 5 + 610 + 39 = 666.

It is not a de Polignac number, because 12561039 - 2⁴ = 12561023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561139) 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, 697827 + ... + 697844.

It is an arithmetic number, because the mean of its divisors is an integer number (3023956).

Almost surely, 2^12561039 is an apocalyptic number.

12561039 is a deficient number, since it is larger than the sum of its proper divisors (5582697).

12561039 is a wasteful number, since it uses less digits than its factorization.

12561039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395677 (or 1395674 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 12561039 is about 3544.1556117078. The cubic root of 12561039 is about 232.4565857197.

The spelling of 12561039 in words is "twelve million, five hundred sixty-one thousand, thirty-nine".