133557 has 4 divisors (see below), whose sum is σ = 178080. Its totient is φ = 89036.

The previous prime is 133543. The next prime is 133559. The reversal of 133557 is 755331.

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.

It is a cyclic number.

It is not a de Polignac number, because 133557 - 2⁴ = 133541 is a prime.

It is a D-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 (133559) 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, 22257 + ... + 22262.

It is an arithmetic number, because the mean of its divisors is an integer number (44520).

2¹³³⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

133557 is a deficient number, since it is larger than the sum of its proper divisors (44523).

133557 is an equidigital number, since it uses as much as digits as its factorization.

133557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44522.

The product of its digits is 1575, while the sum is 24.

The square root of 133557 is about 365.4545115332. The cubic root of 133557 is about 51.1158458472.

Adding to 133557 its reverse (755331), we get a palindrome (888888).

It can be divided in two parts, 13 and 3557, that added together give a triangular number (3570 = T₈₄).

The spelling of 133557 in words is "one hundred thirty-three thousand, five hundred fifty-seven".