199380817 has 2 divisors, whose sum is σ = 199380818. Its totient is φ = 199380816.

The previous prime is 199380793. The next prime is 199380823. The reversal of 199380817 is 718083991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166306816 + 33074001 = 12896^2 + 5751^2 .

It is a cyclic number.

It is not a de Polignac number, because 199380817 - 2¹¹ = 199378769 is a prime.

It is not a weakly prime, because it can be changed into another prime (199380877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99690408 + 99690409.

It is an arithmetic number, because the mean of its divisors is an integer number (99690409).

Almost surely, 2^199380817 is an apocalyptic number.

It is an amenable number.

199380817 is a deficient number, since it is larger than the sum of its proper divisors (1).

199380817 is an equidigital number, since it uses as much as digits as its factorization.

199380817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 199380817 is about 14120.2272290498. The cubic root of 199380817 is about 584.1994230818.

The spelling of 199380817 in words is "one hundred ninety-nine million, three hundred eighty thousand, eight hundred seventeen".