9103721 has 16 divisors (see below), whose sum is σ = 10653120. Its totient is φ = 7687680.

The previous prime is 9103697. The next prime is 9103747. The reversal of 9103721 is 1273019.

9103721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9103721 - 2⁶ = 9103657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9103771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16370 + ... + 16916.

It is an arithmetic number, because the mean of its divisors is an integer number (665820).

Almost surely, 2^9103721 is an apocalyptic number.

It is an amenable number.

9103721 is a deficient number, since it is larger than the sum of its proper divisors (1549399).

9103721 is a wasteful number, since it uses less digits than its factorization.

9103721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 9103721 is about 3017.2373125096. The cubic root of 9103721 is about 208.8044002268.

The spelling of 9103721 in words is "nine million, one hundred three thousand, seven hundred twenty-one".