13500553 has 4 divisors (see below), whose sum is σ = 14727888. Its totient is φ = 12273220.

The previous prime is 13500551. The next prime is 13500589. The reversal of 13500553 is 35500531.

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 13500553 - 2¹ = 13500551 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13500551) 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, 613651 + ... + 613672.

It is an arithmetic number, because the mean of its divisors is an integer number (3681972).

Almost surely, 2^13500553 is an apocalyptic number.

It is an amenable number.

13500553 is a deficient number, since it is larger than the sum of its proper divisors (1227335).

13500553 is a wasteful number, since it uses less digits than its factorization.

13500553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227334.

The product of its (nonzero) digits is 1125, while the sum is 22.

The square root of 13500553 is about 3674.3098671723. The cubic root of 13500553 is about 238.1134089834.

Subtracting from 13500553 its sum of digits (22), we obtain a palindrome (13500531).

The spelling of 13500553 in words is "thirteen million, five hundred thousand, five hundred fifty-three".