865881853 has 2 divisors, whose sum is σ = 865881854. Its totient is φ = 865881852.

The previous prime is 865881839. The next prime is 865881857. The reversal of 865881853 is 358188568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 552344004 + 313537849 = 23502^2 + 17707^2 .

It is a cyclic number.

It is not a de Polignac number, because 865881853 - 2²⁵ = 832327421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 865881853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865881857) 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, 432940926 + 432940927.

It is an arithmetic number, because the mean of its divisors is an integer number (432940927).

Almost surely, 2^865881853 is an apocalyptic number.

It is an amenable number.

865881853 is a deficient number, since it is larger than the sum of its proper divisors (1).

865881853 is an equidigital number, since it uses as much as digits as its factorization.

865881853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1843200, while the sum is 52.

The square root of 865881853 is about 29425.8704714066. The cubic root of 865881853 is about 953.1316240593.

The spelling of 865881853 in words is "eight hundred sixty-five million, eight hundred eighty-one thousand, eight hundred fifty-three".