12561543 has 12 divisors (see below), whose sum is σ = 18212688. Its totient is φ = 8342880.

The previous prime is 12561529. The next prime is 12561551. The reversal of 12561543 is 34516521.

12561543 is a `hidden beast` number, since 1 + 2 + 5 + 615 + 43 = 666.

It is not a de Polignac number, because 12561543 - 2⁵ = 12561511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12560543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46 + ... + 5012.

It is an arithmetic number, because the mean of its divisors is an integer number (1517724).

Almost surely, 2^12561543 is an apocalyptic number.

12561543 is a deficient number, since it is larger than the sum of its proper divisors (5651145).

12561543 is a wasteful number, since it uses less digits than its factorization.

12561543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5254 (or 5251 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 12561543 is about 3544.2267139674. The cubic root of 12561543 is about 232.4596947129.

The spelling of 12561543 in words is "twelve million, five hundred sixty-one thousand, five hundred forty-three".