989042279 has 2 divisors, whose sum is σ = 989042280. Its totient is φ = 989042278.

The previous prime is 989042239. The next prime is 989042281. The reversal of 989042279 is 972240989.

It is a strong prime.

It is an emirp because it is prime and its reverse (972240989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989042279 - 2⁸ = 989042023 is a prime.

Together with 989042281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989042209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494521139 + 494521140.

It is an arithmetic number, because the mean of its divisors is an integer number (494521140).

Almost surely, 2^989042279 is an apocalyptic number.

989042279 is a deficient number, since it is larger than the sum of its proper divisors (1).

989042279 is an equidigital number, since it uses as much as digits as its factorization.

989042279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 989042279 is about 31449.0425768417. The cubic root of 989042279 is about 996.3340032241.

The spelling of 989042279 in words is "nine hundred eighty-nine million, forty-two thousand, two hundred seventy-nine".