57805981 has 4 divisors (see below), whose sum is σ = 57826332. Its totient is φ = 57785632.

The previous prime is 57805973. The next prime is 57805997. The reversal of 57805981 is 18950875.

57805981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39879225 + 17926756 = 6315^2 + 4234^2 .

It is a cyclic number.

It is not a de Polignac number, because 57805981 - 2³ = 57805973 is a prime.

It is a super-2 number, since 2×57805981² = 6683062878744722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57809981) 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 in 3 ways as a sum of consecutive naturals, for example, 5056 + ... + 11881.

It is an arithmetic number, because the mean of its divisors is an integer number (14456583).

Almost surely, 2^57805981 is an apocalyptic number.

It is an amenable number.

57805981 is a deficient number, since it is larger than the sum of its proper divisors (20351).

57805981 is a wasteful number, since it uses less digits than its factorization.

57805981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20350.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 57805981 is about 7603.0244639880. The cubic root of 57805981 is about 386.6555591174.

The spelling of 57805981 in words is "fifty-seven million, eight hundred five thousand, nine hundred eighty-one".