990810481 has 2 divisors, whose sum is σ = 990810482. Its totient is φ = 990810480.

The previous prime is 990810463. The next prime is 990810493. The reversal of 990810481 is 184018099.

990810481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962550625 + 28259856 = 31025^2 + 5316^2 .

It is an emirp because it is prime and its reverse (184018099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990810481 - 2¹³ = 990802289 is a prime.

It is a super-2 number, since 2×990810481² = 1963410818518902722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990810181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495405240 + 495405241.

It is an arithmetic number, because the mean of its divisors is an integer number (495405241).

Almost surely, 2^990810481 is an apocalyptic number.

It is an amenable number.

990810481 is a deficient number, since it is larger than the sum of its proper divisors (1).

990810481 is an equidigital number, since it uses as much as digits as its factorization.

990810481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 990810481 is about 31477.1421987448. The cubic root of 990810481 is about 996.9273957726.

The spelling of 990810481 in words is "nine hundred ninety million, eight hundred ten thousand, four hundred eighty-one".