173533 has 4 divisors (see below), whose sum is σ = 175420. Its totient is φ = 171648.

The previous prime is 173531. The next prime is 173539. The reversal of 173533 is 335371.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 335371 = 151 ⋅2221.

It can be written as a sum of positive squares in 2 ways, for example, as 128164 + 45369 = 358^2 + 213^2 .

It is a cyclic number.

It is not a de Polignac number, because 173533 - 2¹ = 173531 is a prime.

It is a super-2 number, since 2×173533² = 60227404178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798 + ... + 991.

It is an arithmetic number, because the mean of its divisors is an integer number (43855).

2¹⁷³⁵³³ is an apocalyptic number.

It is an amenable number.

173533 is a deficient number, since it is larger than the sum of its proper divisors (1887).

173533 is an equidigital number, since it uses as much as digits as its factorization.

173533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886.

The product of its digits is 945, while the sum is 22.

The square root of 173533 is about 416.5729227878. The cubic root of 173533 is about 55.7777114942. Note that the first 4 decimals are identical.

The spelling of 173533 in words is "one hundred seventy-three thousand, five hundred thirty-three".