13622621 has 4 divisors (see below), whose sum is σ = 13912512. Its totient is φ = 13332732.

The previous prime is 13622597. The next prime is 13622633. The reversal of 13622621 is 12622631.

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 a de Polignac number, because none of the positive numbers 2^k-13622621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13628621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144875 + ... + 144968.

It is an arithmetic number, because the mean of its divisors is an integer number (3478128).

Almost surely, 2^13622621 is an apocalyptic number.

It is an amenable number.

13622621 is a deficient number, since it is larger than the sum of its proper divisors (289891).

13622621 is an equidigital number, since it uses as much as digits as its factorization.

13622621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289890.

The product of its digits is 864, while the sum is 23.

The square root of 13622621 is about 3690.8834985678. The cubic root of 13622621 is about 238.8289071529.

The spelling of 13622621 in words is "thirteen million, six hundred twenty-two thousand, six hundred twenty-one".