12694561 has 4 divisors (see below), whose sum is σ = 13848624. Its totient is φ = 11540500.

The previous prime is 12694541. The next prime is 12694571. The reversal of 12694561 is 16549621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12694561 - 2⁹ = 12694049 is a prime.

It is a super-2 number, since 2×12694561² = 322303757965442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12694511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577015 + ... + 577036.

It is an arithmetic number, because the mean of its divisors is an integer number (3462156).

Almost surely, 2^12694561 is an apocalyptic number.

12694561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12694561 is a deficient number, since it is larger than the sum of its proper divisors (1154063).

12694561 is a wasteful number, since it uses less digits than its factorization.

12694561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154062.

The product of its digits is 12960, while the sum is 34.

The square root of 12694561 is about 3562.9427444179. The cubic root of 12694561 is about 233.2773441626.

The spelling of 12694561 in words is "twelve million, six hundred ninety-four thousand, five hundred sixty-one".