199977091 has 2 divisors, whose sum is σ = 199977092. Its totient is φ = 199977090.

The previous prime is 199977083. The next prime is 199977163. The reversal of 199977091 is 190779991.

It is a weak prime.

It is an emirp because it is prime and its reverse (190779991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199977091 - 2³ = 199977083 is a prime.

It is not a weakly prime, because it can be changed into another prime (199974091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99988545 + 99988546.

It is an arithmetic number, because the mean of its divisors is an integer number (99988546).

Almost surely, 2^199977091 is an apocalyptic number.

199977091 is a deficient number, since it is larger than the sum of its proper divisors (1).

199977091 is an equidigital number, since it uses as much as digits as its factorization.

199977091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 321489, while the sum is 52.

The square root of 199977091 is about 14141.3256450730. The cubic root of 199977091 is about 584.7812180158.

The spelling of 199977091 in words is "one hundred ninety-nine million, nine hundred seventy-seven thousand, ninety-one".