199768871 has 2 divisors, whose sum is σ = 199768872. Its totient is φ = 199768870.

The previous prime is 199768859. The next prime is 199768873. The reversal of 199768871 is 178867991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199768871 is a prime.

It is a super-2 number, since 2×199768871² = 79815203641229282, which contains 22 as substring.

Together with 199768873, 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 (199768873) 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, 99884435 + 99884436.

It is an arithmetic number, because the mean of its divisors is an integer number (99884436).

Almost surely, 2^199768871 is an apocalyptic number.

199768871 is a deficient number, since it is larger than the sum of its proper divisors (1).

199768871 is an equidigital number, since it uses as much as digits as its factorization.

199768871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 56.

The square root of 199768871 is about 14133.9616173244. The cubic root of 199768871 is about 584.5781857089.

The spelling of 199768871 in words is "one hundred ninety-nine million, seven hundred sixty-eight thousand, eight hundred seventy-one".