199997371 has 6 divisors (see below), whose sum is σ = 232650060. Its totient is φ = 171426276.

The previous prime is 199997341. The next prime is 199997377. The reversal of 199997371 is 173799991.

It is not a de Polignac number, because 199997371 - 2⁵ = 199997339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199997377) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2040741 + ... + 2040838.

It is an arithmetic number, because the mean of its divisors is an integer number (38775010).

Almost surely, 2^199997371 is an apocalyptic number.

199997371 is a deficient number, since it is larger than the sum of its proper divisors (32652689).

199997371 is an equidigital number, since it uses as much as digits as its factorization.

199997371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4081593 (or 4081586 counting only the distinct ones).

The product of its digits is 964467, while the sum is 55.

The square root of 199997371 is about 14142.0426742391. The cubic root of 199997371 is about 584.8009852171.

The spelling of 199997371 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, three hundred seventy-one".