135553 has 4 divisors (see below), whose sum is σ = 147888. Its totient is φ = 123220.

The previous prime is 135533. The next prime is 135559. The reversal of 135553 is 355531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 355531 = 11 ⋅32321.

It is a cyclic number.

It is not a de Polignac number, because 135553 - 2¹⁷ = 4481 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (135559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6151 + ... + 6172.

It is an arithmetic number, because the mean of its divisors is an integer number (36972).

2¹³⁵⁵⁵³ is an apocalyptic number.

It is an amenable number.

135553 is a deficient number, since it is larger than the sum of its proper divisors (12335).

135553 is a wasteful number, since it uses less digits than its factorization.

135553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12334.

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

The square root of 135553 is about 368.1752300196. The cubic root of 135553 is about 51.3692286561.

Subtracting from 135553 its sum of digits (22), we obtain a palindrome (135531).

The spelling of 135553 in words is "one hundred thirty-five thousand, five hundred fifty-three".