199987841 has 2 divisors, whose sum is σ = 199987842.
Its totient is φ = 199987840.
The previous prime is 199987811. The next prime is 199987871. The reversal of 199987841 is 148789991.
199987841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a balanced prime because it is at equal distance from previous prime (199987811) and next prime (199987871).
It can be written as a sum of positive squares in only one way, i.e., 156375025 + 43612816 = 12505^2 + 6604^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-199987841 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (199987811) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99993920 + 99993921.
It is an arithmetic number, because the mean of its divisors is an integer number (99993921).
Almost surely, 2199987841 is an apocalyptic number.
It is an amenable number.
199987841 is a deficient number, since it is larger than the sum of its proper divisors (1).
199987841 is an equidigital number, since it uses as much as digits as its factorization.
199987841 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1306368, while the sum is 56.
The square root of 199987841 is about 14141.7057316294.
The cubic root of 199987841 is about 584.7916963585.
The spelling of 199987841 in words is "one hundred ninety-nine million, nine hundred eighty-seven thousand, eight hundred forty-one".