865800049 has 2 divisors, whose sum is σ = 865800050. Its totient is φ = 865800048.

The previous prime is 865800041. The next prime is 865800101. The reversal of 865800049 is 940008568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791409424 + 74390625 = 28132^2 + 8625^2 .

It is a cyclic number.

It is not a de Polignac number, because 865800049 - 2³ = 865800041 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 865799984 and 865800020.

It is not a weakly prime, because it can be changed into another prime (865800041) 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, 432900024 + 432900025.

It is an arithmetic number, because the mean of its divisors is an integer number (432900025).

Almost surely, 2^865800049 is an apocalyptic number.

It is an amenable number.

865800049 is a deficient number, since it is larger than the sum of its proper divisors (1).

865800049 is an equidigital number, since it uses as much as digits as its factorization.

865800049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 865800049 is about 29424.4804372142. The cubic root of 865800049 is about 953.1016074796.

The spelling of 865800049 in words is "eight hundred sixty-five million, eight hundred thousand, forty-nine".