9751721 has 4 divisors (see below), whose sum is σ = 11144832. Its totient is φ = 8358612.

The previous prime is 9751699. The next prime is 9751739. The reversal of 9751721 is 1271579.

9751721 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, and also an emirpimes, since its reverse is a distinct semiprime: 1271579 = 37 ⋅34367.

It is a cyclic number.

It is not a de Polignac number, because 9751721 - 2¹⁴ = 9735337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9751321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696545 + ... + 696558.

It is an arithmetic number, because the mean of its divisors is an integer number (2786208).

Almost surely, 2^9751721 is an apocalyptic number.

It is an amenable number.

9751721 is a deficient number, since it is larger than the sum of its proper divisors (1393111).

9751721 is a wasteful number, since it uses less digits than its factorization.

9751721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393110.

The product of its digits is 4410, while the sum is 32.

The square root of 9751721 is about 3122.7745675921. The cubic root of 9751721 is about 213.6455029960.

The spelling of 9751721 in words is "nine million, seven hundred fifty-one thousand, seven hundred twenty-one".