13553563 has 4 divisors (see below), whose sum is σ = 13565440. Its totient is φ = 13541688.

The previous prime is 13553549. The next prime is 13553569. The reversal of 13553563 is 36535531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36535531 = 631 ⋅57901.

It is a cyclic number.

It is not a de Polignac number, because 13553563 - 2⁹ = 13553051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13553569) 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, 4020 + ... + 6577.

It is an arithmetic number, because the mean of its divisors is an integer number (3391360).

Almost surely, 2^13553563 is an apocalyptic number.

13553563 is a deficient number, since it is larger than the sum of its proper divisors (11877).

13553563 is a wasteful number, since it uses less digits than its factorization.

13553563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11876.

The product of its digits is 20250, while the sum is 31.

The square root of 13553563 is about 3681.5163995289. The cubic root of 13553563 is about 238.4246531999.

The spelling of 13553563 in words is "thirteen million, five hundred fifty-three thousand, five hundred sixty-three".