172171297 has 2 divisors, whose sum is σ = 172171298. Its totient is φ = 172171296.

The previous prime is 172171253. The next prime is 172171309. The reversal of 172171297 is 792171271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107143201 + 65028096 = 10351^2 + 8064^2 .

It is a cyclic number.

It is not a de Polignac number, because 172171297 - 2¹⁵ = 172138529 is a prime.

It is not a weakly prime, because it can be changed into another prime (172171697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86085648 + 86085649.

It is an arithmetic number, because the mean of its divisors is an integer number (86085649).

Almost surely, 2^172171297 is an apocalyptic number.

It is an amenable number.

172171297 is a deficient number, since it is larger than the sum of its proper divisors (1).

172171297 is an equidigital number, since it uses as much as digits as its factorization.

172171297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12348, while the sum is 37.

The square root of 172171297 is about 13121.4060603275. The cubic root of 172171297 is about 556.3143343172.

The spelling of 172171297 in words is "one hundred seventy-two million, one hundred seventy-one thousand, two hundred ninety-seven".