172897 has 4 divisors (see below), whose sum is σ = 177156. Its totient is φ = 168640.

The previous prime is 172883. The next prime is 172933. The reversal of 172897 is 798271.

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 76176 + 96721 = 276^2 + 311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172897 is a prime.

It is a super-3 number, since 3×172897³ = 15505423331934819, which contains 333 as substring.

It is a Duffinian number.

172897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (172807) 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, 2068 + ... + 2149.

It is an arithmetic number, because the mean of its divisors is an integer number (44289).

2¹⁷²⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

172897 is a deficient number, since it is larger than the sum of its proper divisors (4259).

172897 is an equidigital number, since it uses as much as digits as its factorization.

172897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258.

The product of its digits is 7056, while the sum is 34.

The square root of 172897 is about 415.8088503147. The cubic root of 172897 is about 55.7094861399.

The spelling of 172897 in words is "one hundred seventy-two thousand, eight hundred ninety-seven".