989585549 has 2 divisors, whose sum is σ = 989585550. Its totient is φ = 989585548.

The previous prime is 989585537. The next prime is 989585579. The reversal of 989585549 is 945585989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542051524 + 447534025 = 23282^2 + 21155^2 .

It is an emirp because it is prime and its reverse (945585989) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989585549 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 989585491 and 989585500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989585579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494792774 + 494792775.

It is an arithmetic number, because the mean of its divisors is an integer number (494792775).

Almost surely, 2^989585549 is an apocalyptic number.

It is an amenable number.

989585549 is a deficient number, since it is larger than the sum of its proper divisors (1).

989585549 is an equidigital number, since it uses as much as digits as its factorization.

989585549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328000, while the sum is 62.

The square root of 989585549 is about 31457.6786969414. The cubic root of 989585549 is about 996.5163949208.

The spelling of 989585549 in words is "nine hundred eighty-nine million, five hundred eighty-five thousand, five hundred forty-nine".