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56581 = 759137

56581 has 8 divisors (see below), whose sum is σ = 66240. Its totient is φ = 47328.

The previous prime is 56569. The next prime is 56591. The reversal of 56581 is 18565.

56581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56581 - 27 = 56453 is a prime.

It is a super-2 number, since 2×565812 = 6402819122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345 + ... + 481.

It is an arithmetic number, because the mean of its divisors is an integer number (8280).

256581 is an apocalyptic number.

It is an amenable number.

56581 is a deficient number, since it is larger than the sum of its proper divisors (9659).

56581 is a wasteful number, since it uses less digits than its factorization.

56581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203.

The product of its digits is 1200, while the sum is 25.

The square root of 56581 is about 237.8676102373. The cubic root of 56581 is about 38.3904797724.

It can be divided in two parts, 565 and 81, that added together give a palindrome (646).

The spelling of 56581 in words is "fifty-six thousand, five hundred eighty-one".

Divisors: 1 7 59 137 413 959 8083 56581