9261721 has 16 divisors (see below), whose sum is σ = 11289600. Its totient is φ = 7421328.

The previous prime is 9261713. The next prime is 9261731. The reversal of 9261721 is 1271629.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 9261721 - 2³ = 9261713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9261721.

It is not an unprimeable number, because it can be changed into a prime (9261731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10620 + ... + 11458.

It is an arithmetic number, because the mean of its divisors is an integer number (705600).

Almost surely, 2^9261721 is an apocalyptic number.

It is an amenable number.

9261721 is a deficient number, since it is larger than the sum of its proper divisors (2027879).

9261721 is a wasteful number, since it uses less digits than its factorization.

9261721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948.

The product of its digits is 1512, while the sum is 28.

The square root of 9261721 is about 3043.3075756486. The cubic root of 9261721 is about 210.0054495940.

The spelling of 9261721 in words is "nine million, two hundred sixty-one thousand, seven hundred twenty-one".