9921165 has 32 divisors (see below), whose sum is σ = 16761600. Its totient is φ = 5001216.

The previous prime is 9921137. The next prime is 9921167. The reversal of 9921165 is 5611299.

9921165 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 9921165 - 2⁵ = 9921133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51309 + ... + 51501.

It is an arithmetic number, because the mean of its divisors is an integer number (523800).

Almost surely, 2^9921165 is an apocalyptic number.

It is an amenable number.

9921165 is a deficient number, since it is larger than the sum of its proper divisors (6840435).

9921165 is a wasteful number, since it uses less digits than its factorization.

9921165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its digits is 4860, while the sum is 33.

The square root of 9921165 is about 3149.7880881101. The cubic root of 9921165 is about 214.8758251769.

The spelling of 9921165 in words is "nine million, nine hundred twenty-one thousand, one hundred sixty-five".