861318259 has 2 divisors, whose sum is σ = 861318260. Its totient is φ = 861318258.

The previous prime is 861318257. The next prime is 861318343. The reversal of 861318259 is 952813168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861318259 - 2¹ = 861318257 is a prime.

Together with 861318257, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (861318257) 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, 430659129 + 430659130.

It is an arithmetic number, because the mean of its divisors is an integer number (430659130).

Almost surely, 2^861318259 is an apocalyptic number.

861318259 is a deficient number, since it is larger than the sum of its proper divisors (1).

861318259 is an equidigital number, since it uses as much as digits as its factorization.

861318259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 861318259 is about 29348.2241200383. The cubic root of 861318259 is about 951.4541935697.

The spelling of 861318259 in words is "eight hundred sixty-one million, three hundred eighteen thousand, two hundred fifty-nine".