8281949257 has 2 divisors, whose sum is σ = 8281949258. Its totient is φ = 8281949256.

The previous prime is 8281949237. The next prime is 8281949287. The reversal of 8281949257 is 7529491828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7142954256 + 1138995001 = 84516^2 + 33749^2 .

It is a cyclic number.

It is not a de Polignac number, because 8281949257 - 2¹¹ = 8281947209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8281949198 and 8281949207.

It is not a weakly prime, because it can be changed into another prime (8281949237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4140974628 + 4140974629.

It is an arithmetic number, because the mean of its divisors is an integer number (4140974629).

Almost surely, 2^8281949257 is an apocalyptic number.

It is an amenable number.

8281949257 is a deficient number, since it is larger than the sum of its proper divisors (1).

8281949257 is an equidigital number, since it uses as much as digits as its factorization.

8281949257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 55.

The square root of 8281949257 is about 91005.2155483410. The cubic root of 8281949257 is about 2023.2250265197.

The spelling of 8281949257 in words is "eight billion, two hundred eighty-one million, nine hundred forty-nine thousand, two hundred fifty-seven".