172297189 has 4 divisors (see below), whose sum is σ = 172326060. Its totient is φ = 172268320.

The previous prime is 172297121. The next prime is 172297219. The reversal of 172297189 is 981792271.

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 87048900 + 85248289 = 9330^2 + 9233^2 .

It is a cyclic number.

It is not a de Polignac number, because 172297189 - 2¹¹ = 172295141 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 (172294189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792 + ... + 18649.

It is an arithmetic number, because the mean of its divisors is an integer number (43081515).

Almost surely, 2^172297189 is an apocalyptic number.

It is an amenable number.

172297189 is a deficient number, since it is larger than the sum of its proper divisors (28871).

172297189 is an equidigital number, since it uses as much as digits as its factorization.

172297189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28870.

The product of its digits is 127008, while the sum is 46.

The square root of 172297189 is about 13126.2023830200. The cubic root of 172297189 is about 556.4498940035.

The spelling of 172297189 in words is "one hundred seventy-two million, two hundred ninety-seven thousand, one hundred eighty-nine".