866584489 has 2 divisors, whose sum is σ = 866584490. Its totient is φ = 866584488.

The previous prime is 866584429. The next prime is 866584493. The reversal of 866584489 is 984485668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 799475625 + 67108864 = 28275^2 + 8192^2 .

It is a cyclic number.

It is not a de Polignac number, because 866584489 - 2¹¹ = 866582441 is a prime.

It is a super-3 number, since 3×866584489³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (866584429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433292244 + 433292245.

It is an arithmetic number, because the mean of its divisors is an integer number (433292245).

Almost surely, 2^866584489 is an apocalyptic number.

It is an amenable number.

866584489 is a deficient number, since it is larger than the sum of its proper divisors (1).

866584489 is an equidigital number, since it uses as much as digits as its factorization.

866584489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13271040, while the sum is 58.

The square root of 866584489 is about 29437.8071364020. The cubic root of 866584489 is about 953.3893665073.

The spelling of 866584489 in words is "eight hundred sixty-six million, five hundred eighty-four thousand, four hundred eighty-nine".