989878767878971 has 2 divisors, whose sum is σ = 989878767878972. Its totient is φ = 989878767878970.

The previous prime is 989878767878893. The next prime is 989878767878989. The reversal of 989878767878971 is 179878767878989.

It is a strong prime.

It is an emirp because it is prime and its reverse (179878767878989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989878767878971 - 2¹¹ = 989878767876923 is a prime.

It is not a weakly prime, because it can be changed into another prime (989878767828971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494939383939485 + 494939383939486.

It is an arithmetic number, because the mean of its divisors is an integer number (494939383939486).

Almost surely, 2^{989878767878971} is an apocalyptic number.

989878767878971 is a deficient number, since it is larger than the sum of its proper divisors (1).

989878767878971 is an equidigital number, since it uses as much as digits as its factorization.

989878767878971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2408900788224, while the sum is 109.

The spelling of 989878767878971 in words is "nine hundred eighty-nine trillion, eight hundred seventy-eight billion, seven hundred sixty-seven million, eight hundred seventy-eight thousand, nine hundred seventy-one".