878213851 has 2 divisors, whose sum is σ = 878213852. Its totient is φ = 878213850.

The previous prime is 878213813. The next prime is 878213857. The reversal of 878213851 is 158312878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 878213851 - 2¹⁹ = 877689563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 878213798 and 878213807.

It is not a weakly prime, because it can be changed into another prime (878213857) 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, 439106925 + 439106926.

It is an arithmetic number, because the mean of its divisors is an integer number (439106926).

Almost surely, 2^878213851 is an apocalyptic number.

878213851 is a deficient number, since it is larger than the sum of its proper divisors (1).

878213851 is an equidigital number, since it uses as much as digits as its factorization.

878213851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 43.

The square root of 878213851 is about 29634.6731211937. The cubic root of 878213851 is about 957.6351845525.

The spelling of 878213851 in words is "eight hundred seventy-eight million, two hundred thirteen thousand, eight hundred fifty-one".