172813 has 4 divisors (see below), whose sum is σ = 175708. Its totient is φ = 169920.

The previous prime is 172807. The next prime is 172829. The reversal of 172813 is 318271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29929 + 142884 = 173^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 172813 - 2¹³ = 164621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172853) 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, 1356 + ... + 1477.

It is an arithmetic number, because the mean of its divisors is an integer number (43927).

2¹⁷²⁸¹³ is an apocalyptic number.

It is an amenable number.

172813 is a deficient number, since it is larger than the sum of its proper divisors (2895).

172813 is an equidigital number, since it uses as much as digits as its factorization.

172813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894.

The product of its digits is 336, while the sum is 22.

The square root of 172813 is about 415.7078300922. The cubic root of 172813 is about 55.7004627427.

The spelling of 172813 in words is "one hundred seventy-two thousand, eight hundred thirteen".