5681613281 has 2 divisors, whose sum is σ = 5681613282. Its totient is φ = 5681613280.

The previous prime is 5681613277. The next prime is 5681613313. The reversal of 5681613281 is 1823161865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5176083025 + 505530256 = 71945^2 + 22484^2 .

It is a cyclic number.

It is not a de Polignac number, because 5681613281 - 2² = 5681613277 is a prime.

It is a super-2 number, since 2×5681613281² = 64561458949671169922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5681613481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840806640 + 2840806641.

It is an arithmetic number, because the mean of its divisors is an integer number (2840806641).

Almost surely, 2^5681613281 is an apocalyptic number.

It is an amenable number.

5681613281 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681613281 is an equidigital number, since it uses as much as digits as its factorization.

5681613281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 5681613281 is about 75376.4769739207. The cubic root of 5681613281 is about 1784.3931883240.

The spelling of 5681613281 in words is "five billion, six hundred eighty-one million, six hundred thirteen thousand, two hundred eighty-one".