199970999 has 2 divisors, whose sum is σ = 199971000. Its totient is φ = 199970998.

The previous prime is 199970989. The next prime is 199971077. The reversal of 199970999 is 999079991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199970999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199970959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99985499 + 99985500.

It is an arithmetic number, because the mean of its divisors is an integer number (99985500).

Almost surely, 2^199970999 is an apocalyptic number.

199970999 is a deficient number, since it is larger than the sum of its proper divisors (1).

199970999 is an equidigital number, since it uses as much as digits as its factorization.

199970999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3720087, while the sum is 62.

The square root of 199970999 is about 14141.1102463703. The cubic root of 199970999 is about 584.7752797967.

The spelling of 199970999 in words is "one hundred ninety-nine million, nine hundred seventy thousand, nine hundred ninety-nine".