171211161 has 16 divisors (see below), whose sum is σ = 249274368. Its totient is φ = 103664400.

The previous prime is 171211153. The next prime is 171211213. The reversal of 171211161 is 161112171.

171211161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 171211161 - 2³ = 171211153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171211151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46780 + ... + 50306.

It is an arithmetic number, because the mean of its divisors is an integer number (15579648).

Almost surely, 2^171211161 is an apocalyptic number.

171211161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

171211161 is a deficient number, since it is larger than the sum of its proper divisors (78063207).

171211161 is a wasteful number, since it uses less digits than its factorization.

171211161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5012.

The product of its digits is 84, while the sum is 21.

The square root of 171211161 is about 13084.7682822433. The cubic root of 171211161 is about 555.2782858922.

The spelling of 171211161 in words is "one hundred seventy-one million, two hundred eleven thousand, one hundred sixty-one".