8911721 has 8 divisors (see below), whose sum is σ = 10968384. Its totient is φ = 7050960.

The previous prime is 8911697. The next prime is 8911739. The reversal of 8911721 is 1271198.

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

It is a de Polignac number, because none of the positive numbers 2^k-8911721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8911781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48875 + ... + 49056.

It is an arithmetic number, because the mean of its divisors is an integer number (1371048).

Almost surely, 2^8911721 is an apocalyptic number.

It is an amenable number.

8911721 is a deficient number, since it is larger than the sum of its proper divisors (2056663).

8911721 is a wasteful number, since it uses less digits than its factorization.

8911721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97951.

The product of its digits is 1008, while the sum is 29.

The square root of 8911721 is about 2985.2505757474. The cubic root of 8911721 is about 207.3260437833.

The spelling of 8911721 in words is "eight million, nine hundred eleven thousand, seven hundred twenty-one".