13561555 has 16 divisors (see below), whose sum is σ = 19033344. Its totient is φ = 9082080.

The previous prime is 13561549. The next prime is 13561567. The reversal of 13561555 is 55516531.

It is not a de Polignac number, because 13561555 - 2⁵ = 13561523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3001 + ... + 6010.

It is an arithmetic number, because the mean of its divisors is an integer number (1189584).

Almost surely, 2^13561555 is an apocalyptic number.

13561555 is a deficient number, since it is larger than the sum of its proper divisors (5471789).

13561555 is an equidigital number, since it uses as much as digits as its factorization.

13561555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9066.

The product of its digits is 11250, while the sum is 31.

The square root of 13561555 is about 3682.6016618690. The cubic root of 13561555 is about 238.4715071875.

The spelling of 13561555 in words is "thirteen million, five hundred sixty-one thousand, five hundred fifty-five".