172097291 has 2 divisors, whose sum is σ = 172097292. Its totient is φ = 172097290.

The previous prime is 172097279. The next prime is 172097311. The reversal of 172097291 is 192790271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172097291 - 2⁶ = 172097227 is a prime.

It is not a weakly prime, because it can be changed into another prime (172097491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86048645 + 86048646.

It is an arithmetic number, because the mean of its divisors is an integer number (86048646).

Almost surely, 2^172097291 is an apocalyptic number.

172097291 is a deficient number, since it is larger than the sum of its proper divisors (1).

172097291 is an equidigital number, since it uses as much as digits as its factorization.

172097291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 172097291 is about 13118.5857088331. The cubic root of 172097291 is about 556.2346142948.

The spelling of 172097291 in words is "one hundred seventy-two million, ninety-seven thousand, two hundred ninety-one".