999980281 has 2 divisors, whose sum is σ = 999980282. Its totient is φ = 999980280.

The previous prime is 999980231. The next prime is 999980297. The reversal of 999980281 is 182089999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 900300025 + 99680256 = 30005^2 + 9984^2 .

It is a cyclic number.

It is not a de Polignac number, because 999980281 - 2¹³ = 999972089 is a prime.

It is a super-2 number, since 2×999980281² = 1999921124777677922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999980231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499990140 + 499990141.

It is an arithmetic number, because the mean of its divisors is an integer number (499990141).

Almost surely, 2^999980281 is an apocalyptic number.

It is an amenable number.

999980281 is a deficient number, since it is larger than the sum of its proper divisors (1).

999980281 is an equidigital number, since it uses as much as digits as its factorization.

999980281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 55.

The square root of 999980281 is about 31622.4648153809. The cubic root of 999980281 is about 999.9934269568.

The spelling of 999980281 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, two hundred eighty-one".