12616561 has 8 divisors (see below), whose sum is σ = 13031424. Its totient is φ = 12206880.

The previous prime is 12616559. The next prime is 12616579. The reversal of 12616561 is 16561621.

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 12616561 - 2¹ = 12616559 is a prime.

It is a super-2 number, since 2×12616561² = 318355222933442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12616511) 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, 3996 + ... + 6418.

It is an arithmetic number, because the mean of its divisors is an integer number (1628928).

Almost surely, 2^12616561 is an apocalyptic number.

It is an amenable number.

12616561 is a deficient number, since it is larger than the sum of its proper divisors (414863).

12616561 is a wasteful number, since it uses less digits than its factorization.

12616561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its digits is 2160, while the sum is 28.

The square root of 12616561 is about 3551.9798704385. The cubic root of 12616561 is about 232.7985819735.

The spelling of 12616561 in words is "twelve million, six hundred sixteen thousand, five hundred sixty-one".