13561561 has 8 divisors (see below), whose sum is σ = 14636160. Its totient is φ = 12491472.

The previous prime is 13561549. The next prime is 13561567. The reversal of 13561561 is 16516531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13561561 - 2⁷ = 13561433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13561567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7776 + ... + 9358.

It is an arithmetic number, because the mean of its divisors is an integer number (1829520).

Almost surely, 2^13561561 is an apocalyptic number.

It is an amenable number.

13561561 is a deficient number, since it is larger than the sum of its proper divisors (1074599).

13561561 is a wasteful number, since it uses less digits than its factorization.

13561561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255.

The product of its digits is 2700, while the sum is 28.

The square root of 13561561 is about 3682.6024765103. The cubic root of 13561561 is about 238.4715423563.

The spelling of 13561561 in words is "thirteen million, five hundred sixty-one thousand, five hundred sixty-one".