989979230529 has 63 divisors (see below), whose sum is σ = 1521386213043. Its totient is φ = 643885435872.

The previous prime is 989979230521. The next prime is 989979230557. The reversal of 989979230529 is 925032979989.

The square root of 989979230529 is 994977.

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

989979230529 is a `hidden beast` number, since 9 + 8 + 9 + 9 + 7 + 92 + 3 + 0 + 529 = 666.

989979230529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 917428730625 + 72550499904 = 957825^2 + 269352^2 .

It is not a de Polignac number, because 989979230529 - 2³ = 989979230521 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (989979230521) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 1155167869 + ... + 1155168725.

Almost surely, 2^989979230529 is an apocalyptic number.

989979230529 is the 994977-th square number.

989979230529 is the 497489-th centered octagonal number.

It is an amenable number.

989979230529 is a deficient number, since it is larger than the sum of its proper divisors (531406982514).

989979230529 is an frugal number, since it uses more digits than its factorization.

989979230529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 72.

The spelling of 989979230529 in words is "nine hundred eighty-nine billion, nine hundred seventy-nine million, two hundred thirty thousand, five hundred twenty-nine".