9721031 has 2 divisors, whose sum is σ = 9721032. Its totient is φ = 9721030.

The previous prime is 9721013. The next prime is 9721039. The reversal of 9721031 is 1301279.

Together with previous prime (9721013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9721031 - 2¹⁸ = 9458887 is a prime.

It is a super-2 number, since 2×9721031² = 188996887405922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 9720988 and 9721006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9721039) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860515 + 4860516.

It is an arithmetic number, because the mean of its divisors is an integer number (4860516).

Almost surely, 2^9721031 is an apocalyptic number.

9721031 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721031 is an equidigital number, since it uses as much as digits as its factorization.

9721031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 9721031 is about 3117.8567959417. The cubic root of 9721031 is about 213.4211435932.

The spelling of 9721031 in words is "nine million, seven hundred twenty-one thousand, thirty-one".