989794521 has 9 divisors (see below), whose sum is σ = 1429839541. Its totient is φ = 659800092.

The previous prime is 989794513. The next prime is 989794523. The reversal of 989794521 is 125497989.

The square root of 989794521 is 31461.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 989794521 - 2³ = 989794513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989794523) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 89140 + ... + 99626.

Almost surely, 2^989794521 is an apocalyptic number.

989794521 is the 31461-st square number.

989794521 is the 15731-st centered octagonal number.

It is an amenable number.

989794521 is a deficient number, since it is larger than the sum of its proper divisors (440045020).

989794521 is an frugal number, since it uses more digits than its factorization.

989794521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20980 (or 10490 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The cubic root of 989794521 is about 996.5865351822.

The spelling of 989794521 in words is "nine hundred eighty-nine million, seven hundred ninety-four thousand, five hundred twenty-one".