2056320981 has 24 divisors (see below), whose sum is σ = 3489516576. Its totient is φ = 1150388640.

The previous prime is 2056320979. The next prime is 2056321027. The reversal of 2056320981 is 1890236502.

2056320981 is a `hidden beast` number, since 2 + 0 + 563 + 2 + 0 + 98 + 1 = 666.

It is not a de Polignac number, because 2056320981 - 2¹ = 2056320979 is a prime.

It is a super-2 number, since 2×2056320981² = 8456911953801604722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056320181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 797595 + ... + 800168.

It is an arithmetic number, because the mean of its divisors is an integer number (145396524).

Almost surely, 2^2056320981 is an apocalyptic number.

It is an amenable number.

2056320981 is a deficient number, since it is larger than the sum of its proper divisors (1433195595).

2056320981 is a wasteful number, since it uses less digits than its factorization.

2056320981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597793 (or 1597790 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 2056320981 is about 45346.6755231296. The cubic root of 2056320981 is about 1271.6384047681.

The spelling of 2056320981 in words is "two billion, fifty-six million, three hundred twenty thousand, nine hundred eighty-one".