12561749 has 8 divisors (see below), whose sum is σ = 13331520. Its totient is φ = 11810656.

The previous prime is 12561739. The next prime is 12561751. The reversal of 12561749 is 94716521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12561749 - 2⁴ = 12561733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3272 + ... + 5985.

It is an arithmetic number, because the mean of its divisors is an integer number (1666440).

Almost surely, 2^12561749 is an apocalyptic number.

It is an amenable number.

12561749 is a deficient number, since it is larger than the sum of its proper divisors (769771).

12561749 is an equidigital number, since it uses as much as digits as its factorization.

12561749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9339.

The product of its digits is 15120, while the sum is 35.

The square root of 12561749 is about 3544.2557751946. The cubic root of 12561749 is about 232.4609654282.

The spelling of 12561749 in words is "twelve million, five hundred sixty-one thousand, seven hundred forty-nine".