9011721 has 8 divisors (see below), whose sum is σ = 12430080. Its totient is φ = 5800592.

The previous prime is 9011711. The next prime is 9011747. The reversal of 9011721 is 1271109.

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

It is a cyclic number.

It is not a de Polignac number, because 9011721 - 2⁵ = 9011689 is a prime.

It is a super-2 number, since 2×9011721² = 162422230763682, which contains 22 as substring.

9011721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9011711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51705 + ... + 51878.

It is an arithmetic number, because the mean of its divisors is an integer number (1553760).

Almost surely, 2^9011721 is an apocalyptic number.

It is an amenable number.

9011721 is a deficient number, since it is larger than the sum of its proper divisors (3418359).

9011721 is a wasteful number, since it uses less digits than its factorization.

9011721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103615.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 9011721 is about 3001.9528643868. The cubic root of 9011721 is about 208.0986418838.

It can be divided in two parts, 90 and 11721, that added together give a palindrome (11811).

The spelling of 9011721 in words is "nine million, eleven thousand, seven hundred twenty-one".