199880977 has 2 divisors, whose sum is σ = 199880978. Its totient is φ = 199880976.

The previous prime is 199880953. The next prime is 199880983. The reversal of 199880977 is 779088991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146313216 + 53567761 = 12096^2 + 7319^2 .

It is a cyclic number.

It is not a de Polignac number, because 199880977 - 2²⁷ = 65663249 is a prime.

It is not a weakly prime, because it can be changed into another prime (199880477) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99940488 + 99940489.

It is an arithmetic number, because the mean of its divisors is an integer number (99940489).

Almost surely, 2^199880977 is an apocalyptic number.

It is an amenable number.

199880977 is a deficient number, since it is larger than the sum of its proper divisors (1).

199880977 is an equidigital number, since it uses as much as digits as its factorization.

199880977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The square root of 199880977 is about 14137.9268989481. The cubic root of 199880977 is about 584.6875161678.

The spelling of 199880977 in words is "one hundred ninety-nine million, eight hundred eighty thousand, nine hundred seventy-seven".