878695249 has 2 divisors, whose sum is σ = 878695250. Its totient is φ = 878695248.

The previous prime is 878695247. The next prime is 878695267. The reversal of 878695249 is 942596878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 878529600 + 165649 = 29640^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 878695249 - 2¹ = 878695247 is a prime.

Together with 878695247, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 878695193 and 878695202.

It is not a weakly prime, because it can be changed into another prime (878695247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439347624 + 439347625.

It is an arithmetic number, because the mean of its divisors is an integer number (439347625).

Almost surely, 2^878695249 is an apocalyptic number.

It is an amenable number.

878695249 is a deficient number, since it is larger than the sum of its proper divisors (1).

878695249 is an equidigital number, since it uses as much as digits as its factorization.

878695249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 58.

The square root of 878695249 is about 29642.7942171449. The cubic root of 878695249 is about 957.8101303450.

The spelling of 878695249 in words is "eight hundred seventy-eight million, six hundred ninety-five thousand, two hundred forty-nine".