878213813 has 2 divisors, whose sum is σ = 878213814. Its totient is φ = 878213812.

The previous prime is 878213797. The next prime is 878213851. The reversal of 878213813 is 318312878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828115729 + 50098084 = 28777^2 + 7078^2 .

It is a cyclic number.

It is not a de Polignac number, because 878213813 - 2⁴ = 878213797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878213113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439106906 + 439106907.

It is an arithmetic number, because the mean of its divisors is an integer number (439106907).

Almost surely, 2^878213813 is an apocalyptic number.

It is an amenable number.

878213813 is a deficient number, since it is larger than the sum of its proper divisors (1).

878213813 is an equidigital number, since it uses as much as digits as its factorization.

878213813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 878213813 is about 29634.6724800528. The cubic root of 878213813 is about 957.6351707404.

The spelling of 878213813 in words is "eight hundred seventy-eight million, two hundred thirteen thousand, eight hundred thirteen".