171099939 has 4 divisors (see below), whose sum is σ = 228133256. Its totient is φ = 114066624.

The previous prime is 171099911. The next prime is 171099961. The reversal of 171099939 is 939990171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939990171 = 3 ⋅313330057.

It is not a de Polignac number, because 171099939 - 2¹² = 171095843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171099979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28516654 + ... + 28516659.

It is an arithmetic number, because the mean of its divisors is an integer number (57033314).

Almost surely, 2^171099939 is an apocalyptic number.

171099939 is a deficient number, since it is larger than the sum of its proper divisors (57033317).

171099939 is an equidigital number, since it uses as much as digits as its factorization.

171099939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57033316.

The product of its (nonzero) digits is 137781, while the sum is 48.

The square root of 171099939 is about 13080.5175356329. The cubic root of 171099939 is about 555.1580200962.

The spelling of 171099939 in words is "one hundred seventy-one million, ninety-nine thousand, nine hundred thirty-nine".