172056211 has 2 divisors, whose sum is σ = 172056212. Its totient is φ = 172056210.

The previous prime is 172056163. The next prime is 172056221. The reversal of 172056211 is 112650271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172056211 - 2²¹ = 169959059 is a prime.

It is not a weakly prime, because it can be changed into another prime (172056221) 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 as a sum of consecutive naturals, namely, 86028105 + 86028106.

It is an arithmetic number, because the mean of its divisors is an integer number (86028106).

Almost surely, 2^172056211 is an apocalyptic number.

172056211 is a deficient number, since it is larger than the sum of its proper divisors (1).

172056211 is an equidigital number, since it uses as much as digits as its factorization.

172056211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 172056211 is about 13117.0198978274. The cubic root of 172056211 is about 556.1903526329.

The spelling of 172056211 in words is "one hundred seventy-two million, fifty-six thousand, two hundred eleven".