56004581 has 4 divisors (see below), whose sum is σ = 56041164. Its totient is φ = 55968000.

The previous prime is 56004577. The next prime is 56004583. The reversal of 56004581 is 18540065.

It is a happy number.

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 48080356 + 7924225 = 6934^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 56004581 - 2² = 56004577 is a prime.

It is a super-2 number, since 2×56004581² = 6273026185971122, 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 (56004583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15890 + ... + 19091.

It is an arithmetic number, because the mean of its divisors is an integer number (14010291).

Almost surely, 2^56004581 is an apocalyptic number.

It is an amenable number.

56004581 is a deficient number, since it is larger than the sum of its proper divisors (36583).

56004581 is a wasteful number, since it uses less digits than its factorization.

56004581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36582.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 56004581 is about 7483.6208482258. The cubic root of 56004581 is about 382.5966685769.

The spelling of 56004581 in words is "fifty-six million, four thousand, five hundred eighty-one".