13955561 has 4 divisors (see below), whose sum is σ = 14062224. Its totient is φ = 13848900.

The previous prime is 13955551. The next prime is 13955567. The reversal of 13955561 is 16555931.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 13955561 - 2¹⁸ = 13693417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13955567) 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, 53135 + ... + 53396.

It is an arithmetic number, because the mean of its divisors is an integer number (3515556).

Almost surely, 2^13955561 is an apocalyptic number.

It is an amenable number.

13955561 is a deficient number, since it is larger than the sum of its proper divisors (106663).

13955561 is a wasteful number, since it uses less digits than its factorization.

13955561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106662.

The product of its digits is 20250, while the sum is 35.

The square root of 13955561 is about 3735.7142556679. The cubic root of 13955561 is about 240.7589458548.

The spelling of 13955561 in words is "thirteen million, nine hundred fifty-five thousand, five hundred sixty-one".