199207091 has 2 divisors, whose sum is σ = 199207092. Its totient is φ = 199207090.

The previous prime is 199207067. The next prime is 199207097. The reversal of 199207091 is 190702991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199207091 - 2¹⁴ = 199190707 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199207097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99603545 + 99603546.

It is an arithmetic number, because the mean of its divisors is an integer number (99603546).

Almost surely, 2^199207091 is an apocalyptic number.

199207091 is a deficient number, since it is larger than the sum of its proper divisors (1).

199207091 is an equidigital number, since it uses as much as digits as its factorization.

199207091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 199207091 is about 14114.0742168943. The cubic root of 199207091 is about 584.0296974249.

The spelling of 199207091 in words is "one hundred ninety-nine million, two hundred seven thousand, ninety-one".