2099171 has 4 divisors (see below), whose sum is σ = 2138832. Its totient is φ = 2059512.

The previous prime is 2099147. The next prime is 2099179. The reversal of 2099171 is 1719902.

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

It is a cyclic number.

It is not a de Polignac number, because 2099171 - 2¹⁸ = 1837027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2099179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19751 + ... + 19856.

It is an arithmetic number, because the mean of its divisors is an integer number (534708).

2^2099171 is an apocalyptic number.

2099171 is a deficient number, since it is larger than the sum of its proper divisors (39661).

2099171 is an equidigital number, since it uses as much as digits as its factorization.

2099171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39660.

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

The square root of 2099171 is about 1448.8516142104. The cubic root of 2099171 is about 128.0410634852.

The spelling of 2099171 in words is "two million, ninety-nine thousand, one hundred seventy-one".