9115021 has 4 divisors (see below), whose sum is σ = 9181692. Its totient is φ = 9048352.

The previous prime is 9115013. The next prime is 9115033. The reversal of 9115021 is 1205119.

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 7502121 + 1612900 = 2739^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 9115021 - 2³ = 9115013 is a prime.

It is a Duffinian number.

9115021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9115021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9115091) 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 in 3 ways as a sum of consecutive naturals, for example, 33130 + ... + 33403.

It is an arithmetic number, because the mean of its divisors is an integer number (2295423).

Almost surely, 2^9115021 is an apocalyptic number.

It is an amenable number.

9115021 is a deficient number, since it is larger than the sum of its proper divisors (66671).

9115021 is a wasteful number, since it uses less digits than its factorization.

9115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66670.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 9115021 is about 3019.1093057390. The cubic root of 9115021 is about 208.8907573752.

The spelling of 9115021 in words is "nine million, one hundred fifteen thousand, twenty-one".