9128545021 has 4 divisors (see below), whose sum is σ = 9375262492. Its totient is φ = 8881827552.

The previous prime is 9128545009. The next prime is 9128545033. The reversal of 9128545021 is 1205458219.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (9128545009) and next prime (9128545033).

It can be written as a sum of positive squares in 2 ways, for example, as 6681264121 + 2447280900 = 81739^2 + 49470^2 .

It is a cyclic number.

It is not a de Polignac number, because 9128545021 - 2¹³ = 9128536829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 246717433 = 9128545021 / (9 + 1 + 2 + 8 + 5 + 4 + 5 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9128545051) 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, 123358680 + ... + 123358753.

It is an arithmetic number, because the mean of its divisors is an integer number (2343815623).

Almost surely, 2^9128545021 is an apocalyptic number.

It is an amenable number.

9128545021 is a deficient number, since it is larger than the sum of its proper divisors (246717471).

9128545021 is a wasteful number, since it uses less digits than its factorization.

9128545021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246717470.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 9128545021 is about 95543.4195588582. The cubic root of 9128545021 is about 2089.9401721998.

The spelling of 9128545021 in words is "nine billion, one hundred twenty-eight million, five hundred forty-five thousand, twenty-one".