9018921 has 12 divisors (see below), whose sum is σ = 12573008. Its totient is φ = 5750184.

The previous prime is 9018907. The next prime is 9018929. The reversal of 9018921 is 1298109.

It is not a de Polignac number, because 9018921 - 2⁹ = 9018409 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9018929) 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 11 ways as a sum of consecutive naturals, for example, 1255 + ... + 4428.

Almost surely, 2^9018921 is an apocalyptic number.

It is an amenable number.

9018921 is a deficient number, since it is larger than the sum of its proper divisors (3554087).

9018921 is a wasteful number, since it uses less digits than its factorization.

9018921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732 (or 5709 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 9018921 is about 3003.1518443129. The cubic root of 9018921 is about 208.1540479255.

The spelling of 9018921 in words is "nine million, eighteen thousand, nine hundred twenty-one".