133553 has 4 divisors (see below), whose sum is σ = 152640. Its totient is φ = 114468.

The previous prime is 133543. The next prime is 133559. The reversal of 133553 is 355331.

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 133553 - 2¹⁰ = 132529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9533 + ... + 9546.

It is an arithmetic number, because the mean of its divisors is an integer number (38160).

2¹³³⁵⁵³ is an apocalyptic number.

It is an amenable number.

133553 is a deficient number, since it is larger than the sum of its proper divisors (19087).

133553 is an equidigital number, since it uses as much as digits as its factorization.

133553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19086.

The product of its digits is 675, while the sum is 20.

The square root of 133553 is about 365.4490388549. The cubic root of 133553 is about 51.1153355397.

Adding to 133553 its reverse (355331), we get a palindrome (488884).

It can be divided in two parts, 133 and 553, that added together give a palindrome (686).

The spelling of 133553 in words is "one hundred thirty-three thousand, five hundred fifty-three".