878121863 has 2 divisors, whose sum is σ = 878121864. Its totient is φ = 878121862.

The previous prime is 878121817. The next prime is 878121883. The reversal of 878121863 is 368121878.

878121863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 878121863 - 2²² = 873927559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878121883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439060931 + 439060932.

It is an arithmetic number, because the mean of its divisors is an integer number (439060932).

Almost surely, 2^878121863 is an apocalyptic number.

878121863 is a deficient number, since it is larger than the sum of its proper divisors (1).

878121863 is an equidigital number, since it uses as much as digits as its factorization.

878121863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 44.

The square root of 878121863 is about 29633.1210472336. The cubic root of 878121863 is about 957.6017477379.

The spelling of 878121863 in words is "eight hundred seventy-eight million, one hundred twenty-one thousand, eight hundred sixty-three".