171172155 has 32 divisors (see below), whose sum is σ = 341457408. Its totient is φ = 71136000.

The previous prime is 171172129. The next prime is 171172229. The reversal of 171172155 is 551271171.

It is not a de Polignac number, because 171172155 - 2⁶ = 171172091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72946 + ... + 75255.

It is an arithmetic number, because the mean of its divisors is an integer number (10670544).

Almost surely, 2^171172155 is an apocalyptic number.

171172155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

171172155 is a deficient number, since it is larger than the sum of its proper divisors (170285253).

171172155 is a wasteful number, since it uses less digits than its factorization.

171172155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148227.

The product of its digits is 2450, while the sum is 30.

The square root of 171172155 is about 13083.2776856566. The cubic root of 171172155 is about 555.2361141285.

The spelling of 171172155 in words is "one hundred seventy-one million, one hundred seventy-two thousand, one hundred fifty-five".