863664289 has 2 divisors, whose sum is σ = 863664290. Its totient is φ = 863664288.

The previous prime is 863664287. The next prime is 863664301. The reversal of 863664289 is 982466368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755150400 + 108513889 = 27480^2 + 10417^2 .

It is a cyclic number.

It is not a de Polignac number, because 863664289 - 2¹ = 863664287 is a prime.

Together with 863664287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (863664287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431832144 + 431832145.

It is an arithmetic number, because the mean of its divisors is an integer number (431832145).

Almost surely, 2^863664289 is an apocalyptic number.

It is an amenable number.

863664289 is a deficient number, since it is larger than the sum of its proper divisors (1).

863664289 is an equidigital number, since it uses as much as digits as its factorization.

863664289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 52.

The square root of 863664289 is about 29388.1657984979. The cubic root of 863664289 is about 952.3172568683.

The spelling of 863664289 in words is "eight hundred sixty-three million, six hundred sixty-four thousand, two hundred eighty-nine".