9720691 has 4 divisors (see below), whose sum is σ = 9729000. Its totient is φ = 9712384.

The previous prime is 9720673. The next prime is 9720727. The reversal of 9720691 is 1960279.

9720691 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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9720691 - 2¹³ = 9712499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720631) 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, 2041 + ... + 4858.

It is an arithmetic number, because the mean of its divisors is an integer number (2432250).

Almost surely, 2^9720691 is an apocalyptic number.

9720691 is a deficient number, since it is larger than the sum of its proper divisors (8309).

9720691 is a wasteful number, since it uses less digits than its factorization.

9720691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8308.

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

The square root of 9720691 is about 3117.8022708312. The cubic root of 9720691 is about 213.4186553785.

The spelling of 9720691 in words is "nine million, seven hundred twenty thousand, six hundred ninety-one".