13279561 has 4 divisors (see below), whose sum is σ = 13588432. Its totient is φ = 12970692.

The previous prime is 13279549. The next prime is 13279571. The reversal of 13279561 is 16597231.

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 not a de Polignac number, because 13279561 - 2⁵ = 13279529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13279571) 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, 154371 + ... + 154456.

It is an arithmetic number, because the mean of its divisors is an integer number (3397108).

Almost surely, 2^13279561 is an apocalyptic number.

It is an amenable number.

13279561 is a deficient number, since it is larger than the sum of its proper divisors (308871).

13279561 is an equidigital number, since it uses as much as digits as its factorization.

13279561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308870.

The product of its digits is 11340, while the sum is 34.

The square root of 13279561 is about 3644.1131980223. The cubic root of 13279561 is about 236.8070200564.

The spelling of 13279561 in words is "thirteen million, two hundred seventy-nine thousand, five hundred sixty-one".