878856997 has 2 divisors, whose sum is σ = 878856998. Its totient is φ = 878856996.

The previous prime is 878856941. The next prime is 878857009. The reversal of 878856997 is 799658878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850830561 + 28026436 = 29169^2 + 5294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878856997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878856917) 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, 439428498 + 439428499.

It is an arithmetic number, because the mean of its divisors is an integer number (439428499).

Almost surely, 2^878856997 is an apocalyptic number.

It is an amenable number.

878856997 is a deficient number, since it is larger than the sum of its proper divisors (1).

878856997 is an equidigital number, since it uses as much as digits as its factorization.

878856997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 67.

The square root of 878856997 is about 29645.5223769122. The cubic root of 878856997 is about 957.8688971617.

The spelling of 878856997 in words is "eight hundred seventy-eight million, eight hundred fifty-six thousand, nine hundred ninety-seven".