171872158 has 4 divisors (see below), whose sum is σ = 257808240. Its totient is φ = 85936078.

The previous prime is 171872147. The next prime is 171872171. The reversal of 171872158 is 851278171.

171872158 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 171872158.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42968038 + ... + 42968041.

It is an arithmetic number, because the mean of its divisors is an integer number (64452060).

Almost surely, 2^171872158 is an apocalyptic number.

171872158 is a deficient number, since it is larger than the sum of its proper divisors (85936082).

171872158 is an equidigital number, since it uses as much as digits as its factorization.

171872158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85936081.

The product of its digits is 31360, while the sum is 40.

The square root of 171872158 is about 13110.0022120517. The cubic root of 171872158 is about 555.9919581157.

The spelling of 171872158 in words is "one hundred seventy-one million, eight hundred seventy-two thousand, one hundred fifty-eight".