8721165 has 8 divisors (see below), whose sum is σ = 13953888. Its totient is φ = 4651280.

The previous prime is 8721157. The next prime is 8721191. The reversal of 8721165 is 5611278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8721165 - 2³ = 8721157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290691 + ... + 290720.

It is an arithmetic number, because the mean of its divisors is an integer number (1744236).

Almost surely, 2^8721165 is an apocalyptic number.

It is an amenable number.

8721165 is a deficient number, since it is larger than the sum of its proper divisors (5232723).

8721165 is a wasteful number, since it uses less digits than its factorization.

8721165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581419.

The product of its digits is 3360, while the sum is 30.

The square root of 8721165 is about 2953.1618648493. The cubic root of 8721165 is about 205.8376591980.

The spelling of 8721165 in words is "eight million, seven hundred twenty-one thousand, one hundred sixty-five".