199890959 has 2 divisors, whose sum is σ = 199890960. Its totient is φ = 199890958.

The previous prime is 199890919. The next prime is 199890973. The reversal of 199890959 is 959098991.

199890959 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199890959 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 199890898 and 199890907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199890919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99945479 + 99945480.

It is an arithmetic number, because the mean of its divisors is an integer number (99945480).

Almost surely, 2^199890959 is an apocalyptic number.

199890959 is a deficient number, since it is larger than the sum of its proper divisors (1).

199890959 is an equidigital number, since it uses as much as digits as its factorization.

199890959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2361960, while the sum is 59.

The square root of 199890959 is about 14138.2799165952. The cubic root of 199890959 is about 584.6972490493.

The spelling of 199890959 in words is "one hundred ninety-nine million, eight hundred ninety thousand, nine hundred fifty-nine".