12561775 has 12 divisors (see below), whose sum is σ = 15624000. Its totient is φ = 10018880.

The previous prime is 12561751. The next prime is 12561799. The reversal of 12561775 is 57716521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12561751) and next prime (12561799).

It is not a de Polignac number, because 12561775 - 2¹⁷ = 12430703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12561775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11451 + ... + 12499.

It is an arithmetic number, because the mean of its divisors is an integer number (1302000).

Almost surely, 2^12561775 is an apocalyptic number.

12561775 is a deficient number, since it is larger than the sum of its proper divisors (3062225).

12561775 is a wasteful number, since it uses less digits than its factorization.

12561775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538 (or 1533 counting only the distinct ones).

The product of its digits is 14700, while the sum is 34.

The square root of 12561775 is about 3544.2594430995. The cubic root of 12561775 is about 232.4611258087.

The spelling of 12561775 in words is "twelve million, five hundred sixty-one thousand, seven hundred seventy-five".