866457089 has 2 divisors, whose sum is σ = 866457090. Its totient is φ = 866457088.

The previous prime is 866457049. The next prime is 866457103. The reversal of 866457089 is 980754668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666517489 + 199939600 = 25817^2 + 14140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866457089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866457089.

It is not a weakly prime, because it can be changed into another prime (866457029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433228544 + 433228545.

It is an arithmetic number, because the mean of its divisors is an integer number (433228545).

Almost surely, 2^866457089 is an apocalyptic number.

It is an amenable number.

866457089 is a deficient number, since it is larger than the sum of its proper divisors (1).

866457089 is an equidigital number, since it uses as much as digits as its factorization.

866457089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 866457089 is about 29435.6431728610. The cubic root of 866457089 is about 953.3426437086.

The spelling of 866457089 in words is "eight hundred sixty-six million, four hundred fifty-seven thousand, eighty-nine".