5681249281 has 2 divisors, whose sum is σ = 5681249282. Its totient is φ = 5681249280.

The previous prime is 5681249237. The next prime is 5681249339. The reversal of 5681249281 is 1829421865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4816360000 + 864889281 = 69400^2 + 29409^2 .

It is a cyclic number.

It is not a de Polignac number, because 5681249281 - 2⁷ = 5681249153 is a prime.

It is a super-2 number, since 2×5681249281² = 64553186785726033922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5681249201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840624640 + 2840624641.

It is an arithmetic number, because the mean of its divisors is an integer number (2840624641).

Almost surely, 2^5681249281 is an apocalyptic number.

It is an amenable number.

5681249281 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681249281 is an equidigital number, since it uses as much as digits as its factorization.

5681249281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 5681249281 is about 75374.0623888616. The cubic root of 5681249281 is about 1784.3550810143.

The spelling of 5681249281 in words is "five billion, six hundred eighty-one million, two hundred forty-nine thousand, two hundred eighty-one".