866099089 has 2 divisors, whose sum is σ = 866099090. Its totient is φ = 866099088.

The previous prime is 866099053. The next prime is 866099137. The reversal of 866099089 is 980990668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609843025 + 256256064 = 24695^2 + 16008^2 .

It is a cyclic number.

It is not a de Polignac number, because 866099089 - 2²¹ = 864001937 is a prime.

It is not a weakly prime, because it can be changed into another prime (866099029) 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, 433049544 + 433049545.

It is an arithmetic number, because the mean of its divisors is an integer number (433049545).

Almost surely, 2^866099089 is an apocalyptic number.

It is an amenable number.

866099089 is a deficient number, since it is larger than the sum of its proper divisors (1).

866099089 is an equidigital number, since it uses as much as digits as its factorization.

866099089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 866099089 is about 29429.5614816123. The cubic root of 866099089 is about 953.2113259215.

The spelling of 866099089 in words is "eight hundred sixty-six million, ninety-nine thousand, eighty-nine".