9720751 has 4 divisors (see below), whose sum is σ = 9983512. Its totient is φ = 9457992.

The previous prime is 9720727. The next prime is 9720757. The reversal of 9720751 is 1570279.

9720751 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.

It is a cyclic number.

It is not a de Polignac number, because 9720751 - 2¹⁹ = 9196463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9720757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131325 + ... + 131398.

It is an arithmetic number, because the mean of its divisors is an integer number (2495878).

Almost surely, 2^9720751 is an apocalyptic number.

9720751 is a deficient number, since it is larger than the sum of its proper divisors (262761).

9720751 is a wasteful number, since it uses less digits than its factorization.

9720751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262760.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 9720751 is about 3117.8118929788. The cubic root of 9720751 is about 213.4190944794.

The spelling of 9720751 in words is "nine million, seven hundred twenty thousand, seven hundred fifty-one".