199995797 has 2 divisors, whose sum is σ = 199995798. Its totient is φ = 199995796.

The previous prime is 199995743. The next prime is 199995811. The reversal of 199995797 is 797599991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199346161 + 649636 = 14119^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 199995797 - 2²² = 195801493 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 (199994797) 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, 99997898 + 99997899.

It is an arithmetic number, because the mean of its divisors is an integer number (99997899).

Almost surely, 2^199995797 is an apocalyptic number.

It is an amenable number.

199995797 is a deficient number, since it is larger than the sum of its proper divisors (1).

199995797 is an equidigital number, since it uses as much as digits as its factorization.

199995797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14467005, while the sum is 65.

The square root of 199995797 is about 14141.9870244602. The cubic root of 199995797 is about 584.7994510650.

The spelling of 199995797 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, seven hundred ninety-seven".