13630561 has 4 divisors (see below), whose sum is σ = 15577792. Its totient is φ = 11683332.

The previous prime is 13630553. The next prime is 13630579. The reversal of 13630561 is 16503631.

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 13630561 - 2³ = 13630553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13630061) 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, 973605 + ... + 973618.

It is an arithmetic number, because the mean of its divisors is an integer number (3894448).

Almost surely, 2^13630561 is an apocalyptic number.

It is an amenable number.

13630561 is a deficient number, since it is larger than the sum of its proper divisors (1947231).

13630561 is an equidigital number, since it uses as much as digits as its factorization.

13630561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947230.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 13630561 is about 3691.9589651024. The cubic root of 13630561 is about 238.8752989405.

The spelling of 13630561 in words is "thirteen million, six hundred thirty thousand, five hundred sixty-one".