172090897 has 4 divisors (see below), whose sum is σ = 187735536. Its totient is φ = 156446260.

The previous prime is 172090879. The next prime is 172090909. The reversal of 172090897 is 798090271.

It is a happy number.

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 172090897 - 2²⁷ = 37873169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172090837) 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, 7822303 + ... + 7822324.

It is an arithmetic number, because the mean of its divisors is an integer number (46933884).

Almost surely, 2^172090897 is an apocalyptic number.

It is an amenable number.

172090897 is a deficient number, since it is larger than the sum of its proper divisors (15644639).

172090897 is a wasteful number, since it uses less digits than its factorization.

172090897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15644638.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 172090897 is about 13118.3420065190. The cubic root of 172090897 is about 556.2277255399.

The spelling of 172090897 in words is "one hundred seventy-two million, ninety thousand, eight hundred ninety-seven".