8411575721 has 2 divisors, whose sum is σ = 8411575722. Its totient is φ = 8411575720.

The previous prime is 8411575651. The next prime is 8411575729. The reversal of 8411575721 is 1275751148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5908074496 + 2503501225 = 76864^2 + 50035^2 .

It is a cyclic number.

It is not a de Polignac number, because 8411575721 - 2¹⁸ = 8411313577 is a prime.

It is a super-2 number, since 2×8411575721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8411575729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4205787860 + 4205787861.

It is an arithmetic number, because the mean of its divisors is an integer number (4205787861).

Almost surely, 2^8411575721 is an apocalyptic number.

It is an amenable number.

8411575721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8411575721 is an equidigital number, since it uses as much as digits as its factorization.

8411575721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 41.

The square root of 8411575721 is about 91714.6428930517. The cubic root of 8411575721 is about 2033.7260565064.

The spelling of 8411575721 in words is "eight billion, four hundred eleven million, five hundred seventy-five thousand, seven hundred twenty-one".