199719097 has 4 divisors (see below), whose sum is σ = 208402560. Its totient is φ = 191035636.

The previous prime is 199719073. The next prime is 199719101. The reversal of 199719097 is 790917991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199719097 - 2¹⁵ = 199686329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199719997) 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, 4341697 + ... + 4341742.

It is an arithmetic number, because the mean of its divisors is an integer number (52100640).

Almost surely, 2^199719097 is an apocalyptic number.

It is an amenable number.

199719097 is a deficient number, since it is larger than the sum of its proper divisors (8683463).

199719097 is an equidigital number, since it uses as much as digits as its factorization.

199719097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8683462.

The product of its (nonzero) digits is 321489, while the sum is 52.

The square root of 199719097 is about 14132.2007132647. The cubic root of 199719097 is about 584.5296309109.

The spelling of 199719097 in words is "one hundred ninety-nine million, seven hundred nineteen thousand, ninety-seven".