9271721 has 2 divisors, whose sum is σ = 9271722. Its totient is φ = 9271720.

The previous prime is 9271711. The next prime is 9271727. The reversal of 9271721 is 1271729.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9120400 + 151321 = 3020^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 9271721 - 2¹⁰ = 9270697 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 9⁵ + 2⁹ + 7 + 1 + 7⁷ + 2²³ + 1 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9271727) 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 as a sum of consecutive naturals, namely, 4635860 + 4635861.

It is an arithmetic number, because the mean of its divisors is an integer number (4635861).

Almost surely, 2^9271721 is an apocalyptic number.

It is an amenable number.

9271721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9271721 is an equidigital number, since it uses as much as digits as its factorization.

9271721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 29.

The square root of 9271721 is about 3044.9500816926. The cubic root of 9271721 is about 210.0810042751.

The spelling of 9271721 in words is "nine million, two hundred seventy-one thousand, seven hundred twenty-one".