989744561 has 24 divisors (see below), whose sum is σ = 1153514880. Its totient is φ = 841845312.

The previous prime is 989744557. The next prime is 989744597. The reversal of 989744561 is 165447989.

It is not a de Polignac number, because 989744561 - 2² = 989744557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989744501) 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 in 23 ways as a sum of consecutive naturals, for example, 336680 + ... + 339606.

It is an arithmetic number, because the mean of its divisors is an integer number (48063120).

Almost surely, 2^989744561 is an apocalyptic number.

It is an amenable number.

989744561 is a deficient number, since it is larger than the sum of its proper divisors (163770319).

989744561 is a wasteful number, since it uses less digits than its factorization.

989744561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033 (or 2996 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The square root of 989744561 is about 31460.2059910612. The cubic root of 989744561 is about 996.5697672908.

The spelling of 989744561 in words is "nine hundred eighty-nine million, seven hundred forty-four thousand, five hundred sixty-one".