9445701721 has 9 divisors (see below), whose sum is σ = 10035770749. Its totient is φ = 8888517184.

The previous prime is 9445701691. The next prime is 9445701731. The reversal of 9445701721 is 1271075449.

The square root of 9445701721 is 97189.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1291611721 + 8154090000 = 35939^2 + 90300^2 .

It is not a de Polignac number, because 9445701721 - 2⁵ = 9445701689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9445701731) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1649355 + ... + 1655071.

Almost surely, 2^9445701721 is an apocalyptic number.

9445701721 is the 97189-th square number.

9445701721 is the 48595-th centered octagonal number.

It is an amenable number.

9445701721 is a deficient number, since it is larger than the sum of its proper divisors (590069028).

9445701721 is an frugal number, since it uses more digits than its factorization.

9445701721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11468 (or 5734 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The cubic root of 9445701721 is about 2113.8690286151.

The spelling of 9445701721 in words is "nine billion, four hundred forty-five million, seven hundred one thousand, seven hundred twenty-one".