199964959 has 2 divisors, whose sum is σ = 199964960. Its totient is φ = 199964958.

The previous prime is 199964957. The next prime is 199964993. The reversal of 199964959 is 959469991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199964959 - 2¹ = 199964957 is a prime.

Together with 199964957, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 199964897 and 199964906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199964953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99982479 + 99982480.

It is an arithmetic number, because the mean of its divisors is an integer number (99982480).

Almost surely, 2^199964959 is an apocalyptic number.

199964959 is a deficient number, since it is larger than the sum of its proper divisors (1).

199964959 is an equidigital number, since it uses as much as digits as its factorization.

199964959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7085880, while the sum is 61.

The square root of 199964959 is about 14140.8966830254. The cubic root of 199964959 is about 584.7693921459.

The spelling of 199964959 in words is "one hundred ninety-nine million, nine hundred sixty-four thousand, nine hundred fifty-nine".