172161271 has 2 divisors, whose sum is σ = 172161272. Its totient is φ = 172161270.

The previous prime is 172161247. The next prime is 172161281.

172161271 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 172161271 - 2⁹ = 172160759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172161281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86080635 + 86080636.

It is an arithmetic number, because the mean of its divisors is an integer number (86080636).

Almost surely, 2^172161271 is an apocalyptic number.

172161271 is a deficient number, since it is larger than the sum of its proper divisors (1).

172161271 is an equidigital number, since it uses as much as digits as its factorization.

172161271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 28.

The square root of 172161271 is about 13121.0240072946. The cubic root of 172161271 is about 556.3035355451.

The spelling of 172161271 in words is "one hundred seventy-two million, one hundred sixty-one thousand, two hundred seventy-one".