989681573 has 4 divisors (see below), whose sum is σ = 989829708. Its totient is φ = 989533440.

The previous prime is 989681569. The next prime is 989681611. The reversal of 989681573 is 375186989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 384865924 + 604815649 = 19618^2 + 24593^2 .

It is a cyclic number.

It is not a de Polignac number, because 989681573 - 2² = 989681569 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989684573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63548 + ... + 77573.

It is an arithmetic number, because the mean of its divisors is an integer number (247457427).

Almost surely, 2^989681573 is an apocalyptic number.

It is an amenable number.

989681573 is a deficient number, since it is larger than the sum of its proper divisors (148135).

989681573 is a wasteful number, since it uses less digits than its factorization.

989681573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148134.

The product of its digits is 3265920, while the sum is 56.

The square root of 989681573 is about 31459.2049009507. The cubic root of 989681573 is about 996.5486260555.

The spelling of 989681573 in words is "nine hundred eighty-nine million, six hundred eighty-one thousand, five hundred seventy-three".