8287771321 has 2 divisors, whose sum is σ = 8287771322. Its totient is φ = 8287771320.

The previous prime is 8287771231. The next prime is 8287771379. The reversal of 8287771321 is 1231777828.

Together with previous prime (8287771231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7151070096 + 1136701225 = 84564^2 + 33715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8287771321 is a prime.

It is not a weakly prime, because it can be changed into another prime (8287771381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4143885660 + 4143885661.

It is an arithmetic number, because the mean of its divisors is an integer number (4143885661).

Almost surely, 2^8287771321 is an apocalyptic number.

It is an amenable number.

8287771321 is a deficient number, since it is larger than the sum of its proper divisors (1).

8287771321 is an equidigital number, since it uses as much as digits as its factorization.

8287771321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 263424, while the sum is 46.

The square root of 8287771321 is about 91037.1974579622. The cubic root of 8287771321 is about 2023.6990126180.

The spelling of 8287771321 in words is "eight billion, two hundred eighty-seven million, seven hundred seventy-one thousand, three hundred twenty-one".