171992 has 8 divisors (see below), whose sum is σ = 322500. Its totient is φ = 85992.

The previous prime is 171947. The next prime is 172001. The reversal of 171992 is 299171.

It is a tau number, because it is divible by the number of its divisors (8).

It is a pancake number, because a pancake can be divided into 171992 parts by 586 straight cuts.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 171992.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742 + ... + 10757.

2¹⁷¹⁹⁹² is an apocalyptic number.

It is an amenable number.

171992 is a deficient number, since it is larger than the sum of its proper divisors (150508).

171992 is a wasteful number, since it uses less digits than its factorization.

171992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21505 (or 21501 counting only the distinct ones).

The product of its digits is 1134, while the sum is 29.

The square root of 171992 is about 414.7191820980. The cubic root of 171992 is about 55.6121154351.

The spelling of 171992 in words is "one hundred seventy-one thousand, nine hundred ninety-two".