5991056681 has 2 divisors, whose sum is σ = 5991056682. Its totient is φ = 5991056680.

The previous prime is 5991056597. The next prime is 5991056723. The reversal of 5991056681 is 1866501995.

5991056681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5299840000 + 691216681 = 72800^2 + 26291^2 .

It is a cyclic number.

It is not a de Polignac number, because 5991056681 - 2²⁶ = 5923947817 is a prime.

It is a super-2 number, since 2×5991056681² = 71785520309909471522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5991056081) 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, 2995528340 + 2995528341.

It is an arithmetic number, because the mean of its divisors is an integer number (2995528341).

Almost surely, 2^5991056681 is an apocalyptic number.

It is an amenable number.

5991056681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5991056681 is an equidigital number, since it uses as much as digits as its factorization.

5991056681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 50.

The square root of 5991056681 is about 77401.9165201999. The cubic root of 5991056681 is about 1816.2173055995.

The spelling of 5991056681 in words is "five billion, nine hundred ninety-one million, fifty-six thousand, six hundred eighty-one".