12879561 has 4 divisors (see below), whose sum is σ = 17172752. Its totient is φ = 8586372.

The previous prime is 12879553. The next prime is 12879569. The reversal of 12879561 is 16597821.

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 an interprime number because it is at equal distance from previous prime (12879553) and next prime (12879569).

It is not a de Polignac number, because 12879561 - 2³ = 12879553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12879569) 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, 2146591 + ... + 2146596.

It is an arithmetic number, because the mean of its divisors is an integer number (4293188).

Almost surely, 2^12879561 is an apocalyptic number.

It is an amenable number.

12879561 is a deficient number, since it is larger than the sum of its proper divisors (4293191).

12879561 is an equidigital number, since it uses as much as digits as its factorization.

12879561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293190.

The product of its digits is 30240, while the sum is 39.

The square root of 12879561 is about 3588.8105271803. The cubic root of 12879561 is about 234.4050803703.

The spelling of 12879561 in words is "twelve million, eight hundred seventy-nine thousand, five hundred sixty-one".