9697921 has 4 divisors (see below), whose sum is σ = 9740500. Its totient is φ = 9655344.

The previous prime is 9697907. The next prime is 9697937. The reversal of 9697921 is 1297969.

9697921 is digitally balanced in base 2, 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 an emirpimes, since its reverse is a distinct semiprime: 1297969 = 163 ⋅7963.

It can be written as a sum of positive squares in 2 ways, for example, as 9235521 + 462400 = 3039^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 9697921 - 2¹⁷ = 9566849 is a prime.

It is an Ulam number.

It is a Duffinian number.

9697921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9697991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20946 + ... + 21403.

It is an arithmetic number, because the mean of its divisors is an integer number (2435125).

Almost surely, 2^9697921 is an apocalyptic number.

It is an amenable number.

9697921 is a deficient number, since it is larger than the sum of its proper divisors (42579).

9697921 is a wasteful number, since it uses less digits than its factorization.

9697921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42578.

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

The square root of 9697921 is about 3114.1485192585. The cubic root of 9697921 is about 213.2518859550.

The spelling of 9697921 in words is "nine million, six hundred ninety-seven thousand, nine hundred twenty-one".