989331521 has 2 divisors, whose sum is σ = 989331522. Its totient is φ = 989331520.

The previous prime is 989331479. The next prime is 989331587. The reversal of 989331521 is 125133989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 736362496 + 252969025 = 27136^2 + 15905^2 .

It is a cyclic number.

It is not a de Polignac number, because 989331521 - 2¹⁴ = 989315137 is a prime.

It is not a weakly prime, because it can be changed into another prime (989331221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494665760 + 494665761.

It is an arithmetic number, because the mean of its divisors is an integer number (494665761).

Almost surely, 2^989331521 is an apocalyptic number.

It is an amenable number.

989331521 is a deficient number, since it is larger than the sum of its proper divisors (1).

989331521 is an equidigital number, since it uses as much as digits as its factorization.

989331521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 989331521 is about 31453.6408226456. The cubic root of 989331521 is about 996.4311185709.

It can be divided in two parts, 9893 and 31521, that added together give a palindrome (41414).

The spelling of 989331521 in words is "nine hundred eighty-nine million, three hundred thirty-one thousand, five hundred twenty-one".