13628561 has 4 divisors (see below), whose sum is σ = 14068224. Its totient is φ = 13188900.

The previous prime is 13628557. The next prime is 13628569. The reversal of 13628561 is 16582631.

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 13628561 - 2² = 13628557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13628569) 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, 219785 + ... + 219846.

It is an arithmetic number, because the mean of its divisors is an integer number (3517056).

Almost surely, 2^13628561 is an apocalyptic number.

It is an amenable number.

13628561 is a deficient number, since it is larger than the sum of its proper divisors (439663).

13628561 is an equidigital number, since it uses as much as digits as its factorization.

13628561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439662.

The product of its digits is 8640, while the sum is 32.

The square root of 13628561 is about 3691.6880962508. The cubic root of 13628561 is about 238.8636150495.

The spelling of 13628561 in words is "thirteen million, six hundred twenty-eight thousand, five hundred sixty-one".