199065887 has 2 divisors, whose sum is σ = 199065888. Its totient is φ = 199065886.

The previous prime is 199065871. The next prime is 199065901. The reversal of 199065887 is 788560991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199065887 - 2⁴ = 199065871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199065847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99532943 + 99532944.

It is an arithmetic number, because the mean of its divisors is an integer number (99532944).

Almost surely, 2^199065887 is an apocalyptic number.

199065887 is a deficient number, since it is larger than the sum of its proper divisors (1).

199065887 is an equidigital number, since it uses as much as digits as its factorization.

199065887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 199065887 is about 14109.0710891965. The cubic root of 199065887 is about 583.8916721806.

The spelling of 199065887 in words is "one hundred ninety-nine million, sixty-five thousand, eight hundred eighty-seven".