865755641 has 2 divisors, whose sum is σ = 865755642. Its totient is φ = 865755640.

The previous prime is 865755613. The next prime is 865755743. The reversal of 865755641 is 146557568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756030016 + 109725625 = 27496^2 + 10475^2 .

It is a cyclic number.

It is not a de Polignac number, because 865755641 - 2²⁶ = 798646777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (865755041) 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, 432877820 + 432877821.

It is an arithmetic number, because the mean of its divisors is an integer number (432877821).

Almost surely, 2^865755641 is an apocalyptic number.

It is an amenable number.

865755641 is a deficient number, since it is larger than the sum of its proper divisors (1).

865755641 is an equidigital number, since it uses as much as digits as its factorization.

865755641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008000, while the sum is 47.

The square root of 865755641 is about 29423.7258177818. The cubic root of 865755641 is about 953.0853119312.

The spelling of 865755641 in words is "eight hundred sixty-five million, seven hundred fifty-five thousand, six hundred forty-one".