878445317 has 2 divisors, whose sum is σ = 878445318. Its totient is φ = 878445316.

The previous prime is 878445229. The next prime is 878445329. The reversal of 878445317 is 713544878.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442429156 + 436016161 = 21034^2 + 20881^2 .

It is a cyclic number.

It is not a de Polignac number, because 878445317 - 2¹⁰ = 878444293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878445367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439222658 + 439222659.

It is an arithmetic number, because the mean of its divisors is an integer number (439222659).

Almost surely, 2^878445317 is an apocalyptic number.

It is an amenable number.

878445317 is a deficient number, since it is larger than the sum of its proper divisors (1).

878445317 is an equidigital number, since it uses as much as digits as its factorization.

878445317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752640, while the sum is 47.

The square root of 878445317 is about 29638.5781878956. The cubic root of 878445317 is about 957.7193100437.

The spelling of 878445317 in words is "eight hundred seventy-eight million, four hundred forty-five thousand, three hundred seventeen".