13553281 has 4 divisors (see below), whose sum is σ = 15489472. Its totient is φ = 11617092.

The previous prime is 13553269. The next prime is 13553311. The reversal of 13553281 is 18235531.

13553281 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

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 13553281 - 2¹¹ = 13551233 is a prime.

It is a super-2 number, since 2×13553281² = 367382851729922, which contains 22 as substring.

It is a Duffinian number.

13553281 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (13553201) 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, 968085 + ... + 968098.

It is an arithmetic number, because the mean of its divisors is an integer number (3872368).

Almost surely, 2^13553281 is an apocalyptic number.

It is an amenable number.

13553281 is a deficient number, since it is larger than the sum of its proper divisors (1936191).

13553281 is an equidigital number, since it uses as much as digits as its factorization.

13553281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936190.

The product of its digits is 3600, while the sum is 28.

The square root of 13553281 is about 3681.4780998941. The cubic root of 13553281 is about 238.4229996072.

The spelling of 13553281 in words is "thirteen million, five hundred fifty-three thousand, two hundred eighty-one".