199764371 has 2 divisors, whose sum is σ = 199764372. Its totient is φ = 199764370.

The previous prime is 199764343. The next prime is 199764373. The reversal of 199764371 is 173467991.

199764371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (173467991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199764371 - 2¹⁴ = 199747987 is a prime.

Together with 199764373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199764373) 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, 99882185 + 99882186.

It is an arithmetic number, because the mean of its divisors is an integer number (99882186).

Almost surely, 2^199764371 is an apocalyptic number.

199764371 is a deficient number, since it is larger than the sum of its proper divisors (1).

199764371 is an equidigital number, since it uses as much as digits as its factorization.

199764371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 47.

The square root of 199764371 is about 14133.8024253914. The cubic root of 199764371 is about 584.5737962669.

The spelling of 199764371 in words is "one hundred ninety-nine million, seven hundred sixty-four thousand, three hundred seventy-one".