199787941 has 2 divisors, whose sum is σ = 199787942. Its totient is φ = 199787940.

The previous prime is 199787881. The next prime is 199787971. The reversal of 199787941 is 149787991.

199787941 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 can be written as a sum of positive squares in only one way, i.e., 157602916 + 42185025 = 12554^2 + 6495^2 .

It is a cyclic number.

It is not a de Polignac number, because 199787941 - 2⁹ = 199787429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199787971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99893970 + 99893971.

It is an arithmetic number, because the mean of its divisors is an integer number (99893971).

Almost surely, 2^199787941 is an apocalyptic number.

It is an amenable number.

199787941 is a deficient number, since it is larger than the sum of its proper divisors (1).

199787941 is an equidigital number, since it uses as much as digits as its factorization.

199787941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 55.

The square root of 199787941 is about 14134.6362174624. The cubic root of 199787941 is about 584.5967864569.

It can be divided in two parts, 199 and 787941, that added together give a triangular number (788140 = T₁₂₅₅).

The spelling of 199787941 in words is "one hundred ninety-nine million, seven hundred eighty-seven thousand, nine hundred forty-one".