990281 has 2 divisors, whose sum is σ = 990282. Its totient is φ = 990280.

The previous prime is 990277. The next prime is 990287. The reversal of 990281 is 182099.

990281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 256 = 995^2 + 16^2 .

It is an emirp because it is prime and its reverse (182099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990281 - 2² = 990277 is a prime.

It is a super-2 number, since 2×990281² = 1961312917922, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990281.

It is not a weakly prime, because it can be changed into another prime (990287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495140 + 495141.

It is an arithmetic number, because the mean of its divisors is an integer number (495141).

2⁹⁹⁰²⁸¹ is an apocalyptic number.

It is an amenable number.

990281 is a deficient number, since it is larger than the sum of its proper divisors (1).

990281 is an equidigital number, since it uses as much as digits as its factorization.

990281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 990281 is about 995.1286349010. The cubic root of 990281 is about 99.6749780854.

The spelling of 990281 in words is "nine hundred ninety thousand, two hundred eighty-one".