199822997 has 4 divisors (see below), whose sum is σ = 217988736. Its totient is φ = 181657260.

The previous prime is 199822979. The next prime is 199823009. The reversal of 199822997 is 799228991.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 799228991 = 11 ⋅72657181.

It is a cyclic number.

It is not a de Polignac number, because 199822997 - 2⁶ = 199822933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199822907) 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, 9082853 + ... + 9082874.

It is an arithmetic number, because the mean of its divisors is an integer number (54497184).

Almost surely, 2^199822997 is an apocalyptic number.

It is an amenable number.

199822997 is a deficient number, since it is larger than the sum of its proper divisors (18165739).

199822997 is a wasteful number, since it uses less digits than its factorization.

199822997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18165738.

The product of its digits is 1469664, while the sum is 56.

The square root of 199822997 is about 14135.8762374322. The cubic root of 199822997 is about 584.6309767527.

The spelling of 199822997 in words is "one hundred ninety-nine million, eight hundred twenty-two thousand, nine hundred ninety-seven".