9128891081 has 4 divisors (see below), whose sum is σ = 9665884692. Its totient is φ = 8591897472.

The previous prime is 9128891059. The next prime is 9128891087. The reversal of 9128891081 is 1801988219.

9128891081 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 3446746681 + 5682144400 = 58709^2 + 75380^2 .

It is a cyclic number.

It is not a de Polignac number, because 9128891081 - 2¹⁴ = 9128874697 is a prime.

It is a super-2 number, since 2×9128891081² (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 (9128891087) 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, 268496780 + ... + 268496813.

It is an arithmetic number, because the mean of its divisors is an integer number (2416471173).

Almost surely, 2^9128891081 is an apocalyptic number.

It is an amenable number.

9128891081 is a deficient number, since it is larger than the sum of its proper divisors (536993611).

9128891081 is a wasteful number, since it uses less digits than its factorization.

9128891081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536993610.

The product of its (nonzero) digits is 82944, while the sum is 47.

The square root of 9128891081 is about 95545.2305507711. The cubic root of 9128891081 is about 2089.9665815036.

The spelling of 9128891081 in words is "nine billion, one hundred twenty-eight million, eight hundred ninety-one thousand, eighty-one".