13055561 has 4 divisors (see below), whose sum is σ = 13408452. Its totient is φ = 12702672.

The previous prime is 13055533. The next prime is 13055569. The reversal of 13055561 is 16555031.

13055561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11095561 + 1960000 = 3331^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 13055561 - 2¹⁰ = 13054537 is a prime.

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 13055561.

It is not an unprimeable number, because it can be changed into a prime (13055569) 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, 176390 + ... + 176463.

It is an arithmetic number, because the mean of its divisors is an integer number (3352113).

Almost surely, 2^13055561 is an apocalyptic number.

It is an amenable number.

13055561 is a deficient number, since it is larger than the sum of its proper divisors (352891).

13055561 is an equidigital number, since it uses as much as digits as its factorization.

13055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352890.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 13055561 is about 3613.2479848469. The cubic root of 13055561 is about 235.4679734607.

The spelling of 13055561 in words is "thirteen million, fifty-five thousand, five hundred sixty-one".