199764287 has 2 divisors, whose sum is σ = 199764288. Its totient is φ = 199764286.

The previous prime is 199764247. The next prime is 199764289. The reversal of 199764287 is 782467991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199764287 - 2²⁰ = 198715711 is a prime.

Together with 199764289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199764289) 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, 99882143 + 99882144.

It is an arithmetic number, because the mean of its divisors is an integer number (99882144).

Almost surely, 2^199764287 is an apocalyptic number.

199764287 is a deficient number, since it is larger than the sum of its proper divisors (1).

199764287 is an equidigital number, since it uses as much as digits as its factorization.

199764287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 199764287 is about 14133.7994537916. The cubic root of 199764287 is about 584.5737143300.

The spelling of 199764287 in words is "one hundred ninety-nine million, seven hundred sixty-four thousand, two hundred eighty-seven".