866084489 has 2 divisors, whose sum is σ = 866084490. Its totient is φ = 866084488.

The previous prime is 866084477. The next prime is 866084539. The reversal of 866084489 is 984480668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 480354889 + 385729600 = 21917^2 + 19640^2 .

It is a cyclic number.

It is not a de Polignac number, because 866084489 - 2¹² = 866080393 is a prime.

It is a super-2 number, since 2×866084489² = 1500204684172782242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866084489.

It is not a weakly prime, because it can be changed into another prime (866584489) 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, 433042244 + 433042245.

It is an arithmetic number, because the mean of its divisors is an integer number (433042245).

Almost surely, 2^866084489 is an apocalyptic number.

It is an amenable number.

866084489 is a deficient number, since it is larger than the sum of its proper divisors (1).

866084489 is an equidigital number, since it uses as much as digits as its factorization.

866084489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2654208, while the sum is 53.

The square root of 866084489 is about 29429.3134306596. The cubic root of 866084489 is about 953.2059697354.

The spelling of 866084489 in words is "eight hundred sixty-six million, eighty-four thousand, four hundred eighty-nine".