981813199 has 2 divisors, whose sum is σ = 981813200. Its totient is φ = 981813198.

The previous prime is 981813197. The next prime is 981813247. The reversal of 981813199 is 991318189.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981813199 - 2¹ = 981813197 is a prime.

It is a super-2 number, since 2×981813199² = 1927914315461227202, which contains 22 as substring.

Together with 981813197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981813191) 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, 490906599 + 490906600.

It is an arithmetic number, because the mean of its divisors is an integer number (490906600).

Almost surely, 2^981813199 is an apocalyptic number.

981813199 is a deficient number, since it is larger than the sum of its proper divisors (1).

981813199 is an equidigital number, since it uses as much as digits as its factorization.

981813199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 49.

The square root of 981813199 is about 31333.8985605047. The cubic root of 981813199 is about 993.9006060310.

The spelling of 981813199 in words is "nine hundred eighty-one million, eight hundred thirteen thousand, one hundred ninety-nine".