5981320981 has 2 divisors, whose sum is σ = 5981320982. Its totient is φ = 5981320980.

The previous prime is 5981320889. The next prime is 5981320997. The reversal of 5981320981 is 1890231895.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4354812081 + 1626508900 = 65991^2 + 40330^2 .

It is a cyclic number.

It is not a de Polignac number, because 5981320981 - 2⁷ = 5981320853 is a prime.

It is a super-2 number, since 2×5981320981² = 71552401355501604722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5981323981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2990660490 + 2990660491.

It is an arithmetic number, because the mean of its divisors is an integer number (2990660491).

Almost surely, 2^5981320981 is an apocalyptic number.

It is an amenable number.

5981320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5981320981 is an equidigital number, since it uses as much as digits as its factorization.

5981320981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 5981320981 is about 77339.0003879026. Note that the first 3 decimals coincide. The cubic root of 5981320981 is about 1815.2329643011.

The spelling of 5981320981 in words is "five billion, nine hundred eighty-one million, three hundred twenty thousand, nine hundred eighty-one".