989179845991 has 2 divisors, whose sum is σ = 989179845992. Its totient is φ = 989179845990.

The previous prime is 989179845893. The next prime is 989179846013. The reversal of 989179845991 is 199548971989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989179845991 - 2¹¹ = 989179843943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989179840991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494589922995 + 494589922996.

It is an arithmetic number, because the mean of its divisors is an integer number (494589922996).

Almost surely, 2^989179845991 is an apocalyptic number.

989179845991 is a deficient number, since it is larger than the sum of its proper divisors (1).

989179845991 is an equidigital number, since it uses as much as digits as its factorization.

989179845991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529079040, while the sum is 79.

The spelling of 989179845991 in words is "nine hundred eighty-nine billion, one hundred seventy-nine million, eight hundred forty-five thousand, nine hundred ninety-one".