8989091729 has 4 divisors (see below), whose sum is σ = 9462201840. Its totient is φ = 8515981620.

The previous prime is 8989091723. The next prime is 8989091747. The reversal of 8989091729 is 9271909898.

8989091729 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9271909898 = 2 ⋅4635954949.

It is a cyclic number.

It is not a de Polignac number, because 8989091729 - 2¹² = 8989087633 is a prime.

It is a super-2 number, since 2×8989091729² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8989091723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236555027 + ... + 236555064.

It is an arithmetic number, because the mean of its divisors is an integer number (2365550460).

Almost surely, 2^8989091729 is an apocalyptic number.

It is an amenable number.

8989091729 is a deficient number, since it is larger than the sum of its proper divisors (473110111).

8989091729 is a wasteful number, since it uses less digits than its factorization.

8989091729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473110110.

The product of its (nonzero) digits is 5878656, while the sum is 62.

The square root of 8989091729 is about 94810.8207379305. The cubic root of 8989091729 is about 2079.2431085609.

The spelling of 8989091729 in words is "eight billion, nine hundred eighty-nine million, ninety-one thousand, seven hundred twenty-nine".