989579 has 2 divisors, whose sum is σ = 989580. Its totient is φ = 989578.

The previous prime is 989561. The next prime is 989581. The reversal of 989579 is 975989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989579 - 2⁸ = 989323 is a prime.

Together with 989581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494789 + 494790.

It is an arithmetic number, because the mean of its divisors is an integer number (494790).

2⁹⁸⁹⁵⁷⁹ is an apocalyptic number.

989579 is a deficient number, since it is larger than the sum of its proper divisors (1).

989579 is an equidigital number, since it uses as much as digits as its factorization.

989579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 989579 is about 994.7758541501. The cubic root of 989579 is about 99.6514196627.

The spelling of 989579 in words is "nine hundred eighty-nine thousand, five hundred seventy-nine".