999722489 has 2 divisors, whose sum is σ = 999722490. Its totient is φ = 999722488.

The previous prime is 999722461. The next prime is 999722527. The reversal of 999722489 is 984227999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744362089 + 255360400 = 27283^2 + 15980^2 .

It is a cyclic number.

It is not a de Polignac number, because 999722489 - 2¹² = 999718393 is a prime.

It is not a weakly prime, because it can be changed into another prime (999722389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499861244 + 499861245.

It is an arithmetic number, because the mean of its divisors is an integer number (499861245).

Almost surely, 2^999722489 is an apocalyptic number.

It is an amenable number.

999722489 is a deficient number, since it is larger than the sum of its proper divisors (1).

999722489 is an equidigital number, since it uses as much as digits as its factorization.

999722489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 59.

The square root of 999722489 is about 31618.3884630447. The cubic root of 999722489 is about 999.9074877751.

The spelling of 999722489 in words is "nine hundred ninety-nine million, seven hundred twenty-two thousand, four hundred eighty-nine".