12610561 has 4 divisors (see below), whose sum is σ = 12674772. Its totient is φ = 12546352.

The previous prime is 12610553. The next prime is 12610571. The reversal of 12610561 is 16501621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16501621 = 983 ⋅16787.

It can be written as a sum of positive squares in 2 ways, for example, as 12531600 + 78961 = 3540^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 12610561 - 2³ = 12610553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12610501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31810 + ... + 32203.

It is an arithmetic number, because the mean of its divisors is an integer number (3168693).

Almost surely, 2^12610561 is an apocalyptic number.

It is an amenable number.

12610561 is a deficient number, since it is larger than the sum of its proper divisors (64211).

12610561 is an equidigital number, since it uses as much as digits as its factorization.

12610561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64210.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 12610561 is about 3551.1351706180. The cubic root of 12610561 is about 232.7616724710.

The spelling of 12610561 in words is "twelve million, six hundred ten thousand, five hundred sixty-one".