989558239 has 2 divisors, whose sum is σ = 989558240. Its totient is φ = 989558238.

The previous prime is 989558191. The next prime is 989558267. The reversal of 989558239 is 932855989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989558239 - 2²¹ = 987461087 is a prime.

It is a super-2 number, since 2×989558239² = 1958451016745562242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989558839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494779119 + 494779120.

It is an arithmetic number, because the mean of its divisors is an integer number (494779120).

Almost surely, 2^989558239 is an apocalyptic number.

989558239 is a deficient number, since it is larger than the sum of its proper divisors (1).

989558239 is an equidigital number, since it uses as much as digits as its factorization.

989558239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 58.

The square root of 989558239 is about 31457.2446186884. The cubic root of 989558239 is about 996.5072277453.

The spelling of 989558239 in words is "nine hundred eighty-nine million, five hundred fifty-eight thousand, two hundred thirty-nine".