9105921 has 48 divisors (see below), whose sum is σ = 15575040. Its totient is φ = 5067360.

The previous prime is 9105917. The next prime is 9105937. The reversal of 9105921 is 1295019.

It is a happy number.

It is not a de Polignac number, because 9105921 - 2² = 9105917 is a prime.

It is a super-4 number, since 4×9105921⁴ (a number of 29 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (9105911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88356 + ... + 88458.

It is an arithmetic number, because the mean of its divisors is an integer number (324480).

Almost surely, 2^9105921 is an apocalyptic number.

It is an amenable number.

9105921 is a deficient number, since it is larger than the sum of its proper divisors (6469119).

9105921 is a wasteful number, since it uses less digits than its factorization.

9105921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 9105921 is about 3017.6018624066. The cubic root of 9105921 is about 208.8212187227.

The spelling of 9105921 in words is "nine million, one hundred five thousand, nine hundred twenty-one".