878191 has 2 divisors, whose sum is σ = 878192. Its totient is φ = 878190.

The previous prime is 878183. The next prime is 878197. The reversal of 878191 is 191878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 878191 - 2³ = 878183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439095 + 439096.

It is an arithmetic number, because the mean of its divisors is an integer number (439096).

2⁸⁷⁸¹⁹¹ is an apocalyptic number.

878191 is a deficient number, since it is larger than the sum of its proper divisors (1).

878191 is an equidigital number, since it uses as much as digits as its factorization.

878191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 34.

The square root of 878191 is about 937.1184556928. The cubic root of 878191 is about 95.7626878637.

The spelling of 878191 in words is "eight hundred seventy-eight thousand, one hundred ninety-one".