978883813 has 2 divisors, whose sum is σ = 978883814. Its totient is φ = 978883812.

The previous prime is 978883771. The next prime is 978883849. The reversal of 978883813 is 318388879.

978883813 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 can be written as a sum of positive squares in only one way, i.e., 592289569 + 386594244 = 24337^2 + 19662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978883813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978883883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489441906 + 489441907.

It is an arithmetic number, because the mean of its divisors is an integer number (489441907).

Almost surely, 2^978883813 is an apocalyptic number.

It is an amenable number.

978883813 is a deficient number, since it is larger than the sum of its proper divisors (1).

978883813 is an equidigital number, since it uses as much as digits as its factorization.

978883813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 55.

The square root of 978883813 is about 31287.1189629215. The cubic root of 978883813 is about 992.9111377755.

The spelling of 978883813 in words is "nine hundred seventy-eight million, eight hundred eighty-three thousand, eight hundred thirteen".