172997 has 4 divisors (see below), whose sum is σ = 188736. Its totient is φ = 157260.

The previous prime is 172993. The next prime is 172999. The reversal of 172997 is 799271.

172997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 799271 = 11 ⋅72661.

It is a cyclic number.

It is not a de Polignac number, because 172997 - 2² = 172993 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 (172993) 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, 7853 + ... + 7874.

It is an arithmetic number, because the mean of its divisors is an integer number (47184).

2¹⁷²⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

172997 is a deficient number, since it is larger than the sum of its proper divisors (15739).

172997 is a wasteful number, since it uses less digits than its factorization.

172997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15738.

The product of its digits is 7938, while the sum is 35.

The square root of 172997 is about 415.9290804933. The cubic root of 172997 is about 55.7202244695.

The spelling of 172997 in words is "one hundred seventy-two thousand, nine hundred ninety-seven".