56576981 has 4 divisors (see below), whose sum is σ = 56600364. Its totient is φ = 56553600.

The previous prime is 56576963. The next prime is 56576983. The reversal of 56576981 is 18967565.

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 12567025 + 44009956 = 3545^2 + 6634^2 .

It is a cyclic number.

It is not a de Polignac number, because 56576981 - 2¹⁰ = 56575957 is a prime.

It is a super-2 number, since 2×56576981² = 6401909558148722, 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 (56576983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7580 + ... + 13061.

It is an arithmetic number, because the mean of its divisors is an integer number (14150091).

Almost surely, 2^56576981 is an apocalyptic number.

It is an amenable number.

56576981 is a deficient number, since it is larger than the sum of its proper divisors (23383).

56576981 is a wasteful number, since it uses less digits than its factorization.

56576981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23382.

The product of its digits is 453600, while the sum is 47.

The square root of 56576981 is about 7521.7671460901. The cubic root of 56576981 is about 383.8957078066.

The spelling of 56576981 in words is "fifty-six million, five hundred seventy-six thousand, nine hundred eighty-one".