864806851 has 2 divisors, whose sum is σ = 864806852. Its totient is φ = 864806850.

The previous prime is 864806819. The next prime is 864806863. The reversal of 864806851 is 158608468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864806851 - 2⁵ = 864806819 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (864807851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432403425 + 432403426.

It is an arithmetic number, because the mean of its divisors is an integer number (432403426).

Almost surely, 2^864806851 is an apocalyptic number.

864806851 is a deficient number, since it is larger than the sum of its proper divisors (1).

864806851 is an equidigital number, since it uses as much as digits as its factorization.

864806851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 46.

The square root of 864806851 is about 29407.5985248711. The cubic root of 864806851 is about 952.7370195235.

The spelling of 864806851 in words is "eight hundred sixty-four million, eight hundred six thousand, eight hundred fifty-one".