9699721 has 4 divisors (see below), whose sum is σ = 10121472. Its totient is φ = 9277972.

The previous prime is 9699713. The next prime is 9699727. The reversal of 9699721 is 1279969.

9699721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9699721 - 2³ = 9699713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9699727) 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 3 ways as a sum of consecutive naturals, for example, 210841 + ... + 210886.

It is an arithmetic number, because the mean of its divisors is an integer number (2530368).

Almost surely, 2^9699721 is an apocalyptic number.

It is an amenable number.

9699721 is a deficient number, since it is larger than the sum of its proper divisors (421751).

9699721 is a wasteful number, since it uses less digits than its factorization.

9699721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421750.

The product of its digits is 61236, while the sum is 43.

The square root of 9699721 is about 3114.4375094068. The cubic root of 9699721 is about 213.2650788050.

The spelling of 9699721 in words is "nine million, six hundred ninety-nine thousand, seven hundred twenty-one".