199616281 has 2 divisors, whose sum is σ = 199616282. Its totient is φ = 199616280.

The previous prime is 199616279. The next prime is 199616321. The reversal of 199616281 is 182616991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192959881 + 6656400 = 13891^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 199616281 - 2¹ = 199616279 is a prime.

It is a super-2 number, since 2×199616281² = 79693319280541922, which contains 22 as substring.

Together with 199616279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (199616581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99808140 + 99808141.

It is an arithmetic number, because the mean of its divisors is an integer number (99808141).

Almost surely, 2^199616281 is an apocalyptic number.

It is an amenable number.

199616281 is a deficient number, since it is larger than the sum of its proper divisors (1).

199616281 is an equidigital number, since it uses as much as digits as its factorization.

199616281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 43.

The square root of 199616281 is about 14128.5625949705. The cubic root of 199616281 is about 584.4293078147.

The spelling of 199616281 in words is "one hundred ninety-nine million, six hundred sixteen thousand, two hundred eighty-one".