999984281 has 2 divisors, whose sum is σ = 999984282. Its totient is φ = 999984280.

The previous prime is 999984277. The next prime is 999984283. The reversal of 999984281 is 182489999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 963792025 + 36192256 = 31045^2 + 6016^2 .

It is a cyclic number.

It is not a de Polignac number, because 999984281 - 2² = 999984277 is a prime.

It is a super-2 number, since 2×999984281² = 1999937124494173922, which contains 22 as substring.

Together with 999984283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999984281.

It is not a weakly prime, because it can be changed into another prime (999984283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499992140 + 499992141.

It is an arithmetic number, because the mean of its divisors is an integer number (499992141).

Almost surely, 2^999984281 is an apocalyptic number.

It is an amenable number.

999984281 is a deficient number, since it is larger than the sum of its proper divisors (1).

999984281 is an equidigital number, since it uses as much as digits as its factorization.

999984281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 59.

The square root of 999984281 is about 31622.5280614944. The cubic root of 999984281 is about 999.9947603059.

The spelling of 999984281 in words is "nine hundred ninety-nine million, nine hundred eighty-four thousand, two hundred eighty-one".