9069721 has 8 divisors (see below), whose sum is σ = 9934920. Its totient is φ = 8241408.

The previous prime is 9069713. The next prime is 9069727. The reversal of 9069721 is 1279609.

It can be written as a sum of positive squares in 4 ways, for example, as 4575321 + 4494400 = 2139^2 + 2120^2 .

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 9069721 - 2³ = 9069713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9069727) 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, 8706 + ... + 9691.

It is an arithmetic number, because the mean of its divisors is an integer number (1241865).

Almost surely, 2^9069721 is an apocalyptic number.

It is an amenable number.

9069721 is a deficient number, since it is larger than the sum of its proper divisors (865199).

9069721 is a wasteful number, since it uses less digits than its factorization.

9069721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18443.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 9069721 is about 3011.5977487042. The cubic root of 9069721 is about 208.5441328022.

The spelling of 9069721 in words is "nine million, sixty-nine thousand, seven hundred twenty-one".