199997377 has 2 divisors, whose sum is σ = 199997378. Its totient is φ = 199997376.

The previous prime is 199997341. The next prime is 199997387. The reversal of 199997377 is 773799991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180203776 + 19793601 = 13424^2 + 4449^2 .

It is a cyclic number.

It is not a de Polignac number, because 199997377 - 2¹¹ = 199995329 is a prime.

It is not a weakly prime, because it can be changed into another prime (199997387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99998688 + 99998689.

It is an arithmetic number, because the mean of its divisors is an integer number (99998689).

Almost surely, 2^199997377 is an apocalyptic number.

It is an amenable number.

199997377 is a deficient number, since it is larger than the sum of its proper divisors (1).

199997377 is an equidigital number, since it uses as much as digits as its factorization.

199997377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6751269, while the sum is 61.

The square root of 199997377 is about 14142.0428863725. The cubic root of 199997377 is about 584.8009910652.

The spelling of 199997377 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, three hundred seventy-seven".