9031921 has 4 divisors (see below), whose sum is σ = 9040500. Its totient is φ = 9023344.

The previous prime is 9031909. The next prime is 9031927. The reversal of 9031921 is 1291309.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1291309 = 61 ⋅21169.

It can be written as a sum of positive squares in 2 ways, for example, as 7952400 + 1079521 = 2820^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 9031921 - 2⁷ = 9031793 is a prime.

It is a Duffinian number.

9031921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9031927) 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, 2446 + ... + 4903.

It is an arithmetic number, because the mean of its divisors is an integer number (2260125).

Almost surely, 2^9031921 is an apocalyptic number.

It is an amenable number.

9031921 is a deficient number, since it is larger than the sum of its proper divisors (8579).

9031921 is a wasteful number, since it uses less digits than its factorization.

9031921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8578.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 9031921 is about 3005.3154576517. The cubic root of 9031921 is about 208.2540119717.

The spelling of 9031921 in words is "nine million, thirty-one thousand, nine hundred twenty-one".