9721441 has 2 divisors, whose sum is σ = 9721442. Its totient is φ = 9721440.

The previous prime is 9721429. The next prime is 9721451. The reversal of 9721441 is 1441279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8433216 + 1288225 = 2904^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 9721441 - 2¹⁷ = 9590369 is a prime.

It is not a weakly prime, because it can be changed into another prime (9721421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860720 + 4860721.

It is an arithmetic number, because the mean of its divisors is an integer number (4860721).

Almost surely, 2^9721441 is an apocalyptic number.

It is an amenable number.

9721441 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721441 is an equidigital number, since it uses as much as digits as its factorization.

9721441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 9721441 is about 3117.9225455421. The cubic root of 9721441 is about 213.4241440101.

The spelling of 9721441 in words is "nine million, seven hundred twenty-one thousand, four hundred forty-one".