8125005281 has 2 divisors, whose sum is σ = 8125005282. Its totient is φ = 8125005280.

The previous prime is 8125005263. The next prime is 8125005299. The reversal of 8125005281 is 1825005218.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (8125005263) and next prime (8125005299).

It can be written as a sum of positive squares in only one way, i.e., 8028160000 + 96845281 = 89600^2 + 9841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8125005281 is a prime.

It is a super-2 number, since 2×8125005281² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8125005241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4062502640 + 4062502641.

It is an arithmetic number, because the mean of its divisors is an integer number (4062502641).

Almost surely, 2^8125005281 is an apocalyptic number.

It is an amenable number.

8125005281 is a deficient number, since it is larger than the sum of its proper divisors (1).

8125005281 is an equidigital number, since it uses as much as digits as its factorization.

8125005281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 8125005281 is about 90138.8111803123. The cubic root of 8125005281 is about 2010.3633148524.

The spelling of 8125005281 in words is "eight billion, one hundred twenty-five million, five thousand, two hundred eighty-one".