999242081 has 2 divisors, whose sum is σ = 999242082. Its totient is φ = 999242080.

The previous prime is 999241993. The next prime is 999242089. The reversal of 999242081 is 180242999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992565025 + 6677056 = 31505^2 + 2584^2 .

It is an emirp because it is prime and its reverse (180242999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999242081 - 2¹⁸ = 998979937 is a prime.

It is a super-2 number, since 2×999242081² = 1996969472882421122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999242089) 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, 499621040 + 499621041.

It is an arithmetic number, because the mean of its divisors is an integer number (499621041).

Almost surely, 2^999242081 is an apocalyptic number.

It is an amenable number.

999242081 is a deficient number, since it is larger than the sum of its proper divisors (1).

999242081 is an equidigital number, since it uses as much as digits as its factorization.

999242081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 999242081 is about 31610.7905785350. The cubic root of 999242081 is about 999.7472964796.

The spelling of 999242081 in words is "nine hundred ninety-nine million, two hundred forty-two thousand, eighty-one".