135573 has 4 divisors (see below), whose sum is σ = 180768. Its totient is φ = 90380.

The previous prime is 135571. The next prime is 135581. The reversal of 135573 is 375531.

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 135573 - 2¹ = 135571 is a prime.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135571) 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, 22593 + ... + 22598.

It is an arithmetic number, because the mean of its divisors is an integer number (45192).

2¹³⁵⁵⁷³ is an apocalyptic number.

It is an amenable number.

135573 is a deficient number, since it is larger than the sum of its proper divisors (45195).

135573 is an equidigital number, since it uses as much as digits as its factorization.

135573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45194.

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

The square root of 135573 is about 368.2023899977. The cubic root of 135573 is about 51.3717549350.

The spelling of 135573 in words is "one hundred thirty-five thousand, five hundred seventy-three".