12976561 has 4 divisors (see below), whose sum is σ = 13974772. Its totient is φ = 11978352.

The previous prime is 12976517. The next prime is 12976567. The reversal of 12976561 is 16567921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8814961 + 4161600 = 2969^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 12976561 - 2¹⁵ = 12943793 is a prime.

It is a super-2 number, since 2×12976561² = 336782270773442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12976561.

It is not an unprimeable number, because it can be changed into a prime (12976567) 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, 499086 + ... + 499111.

It is an arithmetic number, because the mean of its divisors is an integer number (3493693).

Almost surely, 2^12976561 is an apocalyptic number.

It is an amenable number.

12976561 is a deficient number, since it is larger than the sum of its proper divisors (998211).

12976561 is an equidigital number, since it uses as much as digits as its factorization.

12976561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998210.

The product of its digits is 22680, while the sum is 37.

The square root of 12976561 is about 3602.2994045470. The cubic root of 12976561 is about 234.9920685417.

The spelling of 12976561 in words is "twelve million, nine hundred seventy-six thousand, five hundred sixty-one".