13623121 has 4 divisors (see below), whose sum is σ = 13641012. Its totient is φ = 13605232.

The previous prime is 13623101. The next prime is 13623149. The reversal of 13623121 is 12132631.

13623121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7049025 + 6574096 = 2655^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 13623121 - 2²³ = 5234513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13623101) 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, 7750 + ... + 9343.

It is an arithmetic number, because the mean of its divisors is an integer number (3410253).

Almost surely, 2^13623121 is an apocalyptic number.

It is an amenable number.

13623121 is a deficient number, since it is larger than the sum of its proper divisors (17891).

13623121 is an equidigital number, since it uses as much as digits as its factorization.

13623121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17890.

The product of its digits is 216, while the sum is 19.

The square root of 13623121 is about 3690.9512324061. The cubic root of 13623121 is about 238.8318290818.

Adding to 13623121 its reverse (12132631), we get a palindrome (25755752).

The spelling of 13623121 in words is "thirteen million, six hundred twenty-three thousand, one hundred twenty-one".