8481857281 has 2 divisors, whose sum is σ = 8481857282. Its totient is φ = 8481857280.

The previous prime is 8481857257. The next prime is 8481857297. The reversal of 8481857281 is 1827581848.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5452345600 + 3029511681 = 73840^2 + 55041^2 .

It is a cyclic number.

It is not a de Polignac number, because 8481857281 - 2⁵ = 8481857249 is a prime.

It is a super-2 number, since 2×8481857281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8481857221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4240928640 + 4240928641.

It is an arithmetic number, because the mean of its divisors is an integer number (4240928641).

Almost surely, 2^8481857281 is an apocalyptic number.

It is an amenable number.

8481857281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8481857281 is an equidigital number, since it uses as much as digits as its factorization.

8481857281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1146880, while the sum is 52.

The square root of 8481857281 is about 92096.9993050805. Note that the first 3 decimals coincide. The cubic root of 8481857281 is about 2039.3745103544.

The spelling of 8481857281 in words is "eight billion, four hundred eighty-one million, eight hundred fifty-seven thousand, two hundred eighty-one".