9721039 has 2 divisors, whose sum is σ = 9721040. Its totient is φ = 9721038.

The previous prime is 9721031. The next prime is 9721067. The reversal of 9721039 is 9301279.

9721039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9721039 - 2³ = 9721031 is a prime.

9721039 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9721039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9721031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860519 + 4860520.

It is an arithmetic number, because the mean of its divisors is an integer number (4860520).

Almost surely, 2^9721039 is an apocalyptic number.

9721039 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721039 is an equidigital number, since it uses as much as digits as its factorization.

9721039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 9721039 is about 3117.8580788740. The cubic root of 9721039 is about 213.4212021387.

The spelling of 9721039 in words is "nine million, seven hundred twenty-one thousand, thirty-nine".