171992131 has 12 divisors (see below), whose sum is σ = 177457392. Its totient is φ = 166686576.

The previous prime is 171992113. The next prime is 171992141. The reversal of 171992131 is 131299171.

It is not a de Polignac number, because 171992131 - 2⁵ = 171992099 is a prime.

It is a super-2 number, since 2×171992131² = 59162586251842322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171992101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308505 + ... + 309061.

It is an arithmetic number, because the mean of its divisors is an integer number (14788116).

Almost surely, 2^171992131 is an apocalyptic number.

171992131 is a deficient number, since it is larger than the sum of its proper divisors (5465261).

171992131 is an equidigital number, since it uses as much as digits as its factorization.

171992131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 767 counting only the distinct ones).

The product of its digits is 3402, while the sum is 34.

The square root of 171992131 is about 13114.5770423602. The cubic root of 171992131 is about 556.1212955437.

The spelling of 171992131 in words is "one hundred seventy-one million, nine hundred ninety-two thousand, one hundred thirty-one".