868505851 has 2 divisors, whose sum is σ = 868505852. Its totient is φ = 868505850.

The previous prime is 868505837. The next prime is 868505879. The reversal of 868505851 is 158505868.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 868505851 - 2⁷ = 868505723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (868505801) 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, 434252925 + 434252926.

It is an arithmetic number, because the mean of its divisors is an integer number (434252926).

Almost surely, 2^868505851 is an apocalyptic number.

868505851 is a deficient number, since it is larger than the sum of its proper divisors (1).

868505851 is an equidigital number, since it uses as much as digits as its factorization.

868505851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384000, while the sum is 46.

The square root of 868505851 is about 29470.4233257685. The cubic root of 868505851 is about 954.0934540225.

The spelling of 868505851 in words is "eight hundred sixty-eight million, five hundred five thousand, eight hundred fifty-one".