989445561 has 8 divisors (see below), whose sum is σ = 1420742400. Its totient is φ = 608889552.

The previous prime is 989445553. The next prime is 989445593. The reversal of 989445561 is 165544989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 989445561 - 2³ = 989445553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989445161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12685161 + ... + 12685238.

It is an arithmetic number, because the mean of its divisors is an integer number (177592800).

Almost surely, 2^989445561 is an apocalyptic number.

It is an amenable number.

989445561 is a deficient number, since it is larger than the sum of its proper divisors (431296839).

989445561 is a wasteful number, since it uses less digits than its factorization.

989445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25370415.

The product of its digits is 1555200, while the sum is 51.

The square root of 989445561 is about 31455.4535971109. The cubic root of 989445561 is about 996.4694032228.

It can be divided in two parts, 9894 and 45561, that added together give a palindrome (55455).

The spelling of 989445561 in words is "nine hundred eighty-nine million, four hundred forty-five thousand, five hundred sixty-one".