8115262721 has 2 divisors, whose sum is σ = 8115262722. Its totient is φ = 8115262720.

The previous prime is 8115262711. The next prime is 8115262769. The reversal of 8115262721 is 1272625118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8021172721 + 94090000 = 89561^2 + 9700^2 .

It is a cyclic number.

It is not a de Polignac number, because 8115262721 - 2⁶ = 8115262657 is a prime.

It is not a weakly prime, because it can be changed into another prime (8115262711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4057631360 + 4057631361.

It is an arithmetic number, because the mean of its divisors is an integer number (4057631361).

Almost surely, 2^8115262721 is an apocalyptic number.

It is an amenable number.

8115262721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8115262721 is an equidigital number, since it uses as much as digits as its factorization.

8115262721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 8115262721 is about 90084.7529885052. The cubic root of 8115262721 is about 2009.5594622924.

Adding to 8115262721 its reverse (1272625118), we get a palindrome (9387887839).

The spelling of 8115262721 in words is "eight billion, one hundred fifteen million, two hundred sixty-two thousand, seven hundred twenty-one".