199974977 has 2 divisors, whose sum is σ = 199974978. Its totient is φ = 199974976.

The previous prime is 199974947. The next prime is 199975007. The reversal of 199974977 is 779479991.

It is a balanced prime because it is at equal distance from previous prime (199974947) and next prime (199975007).

It can be written as a sum of positive squares in only one way, i.e., 198274561 + 1700416 = 14081^2 + 1304^2 .

It is an emirp because it is prime and its reverse (779479991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199974977 - 2⁸ = 199974721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199974947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99987488 + 99987489.

It is an arithmetic number, because the mean of its divisors is an integer number (99987489).

Almost surely, 2^199974977 is an apocalyptic number.

It is an amenable number.

199974977 is a deficient number, since it is larger than the sum of its proper divisors (1).

199974977 is an equidigital number, since it uses as much as digits as its factorization.

199974977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9001692, while the sum is 62.

The square root of 199974977 is about 14141.2508994077. The cubic root of 199974977 is about 584.7791573934.

The spelling of 199974977 in words is "one hundred ninety-nine million, nine hundred seventy-four thousand, nine hundred seventy-seven".