135557 has 4 divisors (see below), whose sum is σ = 136320. Its totient is φ = 134796.

The previous prime is 135533. The next prime is 135559. The reversal of 135557 is 755531.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 135557 - 2⁸ = 135301 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135559) 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, 44 + ... + 522.

It is an arithmetic number, because the mean of its divisors is an integer number (34080).

2¹³⁵⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

135557 is a deficient number, since it is larger than the sum of its proper divisors (763).

135557 is an equidigital number, since it uses as much as digits as its factorization.

135557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762.

The product of its digits is 2625, while the sum is 26.

The square root of 135557 is about 368.1806621755. The cubic root of 135557 is about 51.3697339318.

Subtracting from 135557 its sum of digits (26), we obtain a palindrome (135531).

The spelling of 135557 in words is "one hundred thirty-five thousand, five hundred fifty-seven".