13555 has 4 divisors (see below), whose sum is σ = 16272. Its totient is φ = 10840.

The previous prime is 13553. The next prime is 13567. The reversal of 13555 is 55531.

13555 = 45² + 46² + ... + 50².

13555 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55531 = 7 ⋅7933.

It is not a de Polignac number, because 13555 - 2¹ = 13553 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

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, 1351 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (4068).

2¹³⁵⁵⁵ is an apocalyptic number.

13555 is a deficient number, since it is larger than the sum of its proper divisors (2717).

13555 is an equidigital number, since it uses as much as digits as its factorization.

13555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716.

The product of its digits is 375, while the sum is 19.

The square root of 13555 is about 116.4259421263. The cubic root of 13555 is about 23.8433079130.

It can be divided in two parts, 135 and 55, that added together give a triangular number (190 = T₁₉).

The spelling of 13555 in words is "thirteen thousand, five hundred fifty-five".