13551 has 4 divisors (see below), whose sum is σ = 18072. Its totient is φ = 9032.

The previous prime is 13537. The next prime is 13553. The reversal of 13551 is 15531.

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

It is a cyclic number.

It is not a de Polignac number, because 13551 - 2⁶ = 13487 is a prime.

It is a D-number.

13551 is a lucky number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 13551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13553) 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, 2256 + ... + 2261.

It is an arithmetic number, because the mean of its divisors is an integer number (4518).

2¹³⁵⁵¹ is an apocalyptic number.

13551 is a deficient number, since it is larger than the sum of its proper divisors (4521).

13551 is an equidigital number, since it uses as much as digits as its factorization.

13551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520.

The product of its digits is 75, while the sum is 15.

The square root of 13551 is about 116.4087625568. The cubic root of 13551 is about 23.8409623427.

The spelling of 13551 in words is "thirteen thousand, five hundred fifty-one".