878648189 has 2 divisors, whose sum is σ = 878648190. Its totient is φ = 878648188.

The previous prime is 878648161. The next prime is 878648201. The reversal of 878648189 is 981846878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 878648164 + 25 = 29642^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878648189 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (878618189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439324094 + 439324095.

It is an arithmetic number, because the mean of its divisors is an integer number (439324095).

Almost surely, 2^878648189 is an apocalyptic number.

It is an amenable number.

878648189 is a deficient number, since it is larger than the sum of its proper divisors (1).

878648189 is an equidigital number, since it uses as much as digits as its factorization.

878648189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 59.

The square root of 878648189 is about 29642.0004216989. Note that the first 3 decimals coincide. The cubic root of 878648189 is about 957.7930309962.

The spelling of 878648189 in words is "eight hundred seventy-eight million, six hundred forty-eight thousand, one hundred eighty-nine".