5681286581 has 2 divisors, whose sum is σ = 5681286582. Its totient is φ = 5681286580.

The previous prime is 5681286563. The next prime is 5681286599. The reversal of 5681286581 is 1856821865.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (5681286563) and next prime (5681286599).

It can be written as a sum of positive squares in only one way, i.e., 5675362225 + 5924356 = 75335^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 5681286581 - 2¹⁰ = 5681285557 is a prime.

It is a super-2 number, since 2×5681286581² = 64554034430901339122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5681286521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840643290 + 2840643291.

It is an arithmetic number, because the mean of its divisors is an integer number (2840643291).

Almost surely, 2^5681286581 is an apocalyptic number.

It is an amenable number.

5681286581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681286581 is an equidigital number, since it uses as much as digits as its factorization.

5681286581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 921600, while the sum is 50.

The square root of 5681286581 is about 75374.3098210524. The cubic root of 5681286581 is about 1784.3589860415.

The spelling of 5681286581 in words is "five billion, six hundred eighty-one million, two hundred eighty-six thousand, five hundred eighty-one".