56538481 has 4 divisors (see below), whose sum is σ = 59864292. Its totient is φ = 53212672.

The previous prime is 56538463. The next prime is 56538511. The reversal of 56538481 is 18483565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18483565 = 5 ⋅3696713.

It can be written as a sum of positive squares in 2 ways, for example, as 20430400 + 36108081 = 4520^2 + 6009^2 .

It is a cyclic number.

It is not a de Polignac number, because 56538481 - 2⁷ = 56538353 is a prime.

It is a super-2 number, since 2×56538481² = 6393199667574722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56538401) 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, 1662880 + ... + 1662913.

It is an arithmetic number, because the mean of its divisors is an integer number (14966073).

Almost surely, 2^56538481 is an apocalyptic number.

It is an amenable number.

56538481 is a deficient number, since it is larger than the sum of its proper divisors (3325811).

56538481 is a wasteful number, since it uses less digits than its factorization.

56538481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325810.

The product of its digits is 115200, while the sum is 40.

The square root of 56538481 is about 7519.2074715358. The cubic root of 56538481 is about 383.8086091415.

The spelling of 56538481 in words is "fifty-six million, five hundred thirty-eight thousand, four hundred eighty-one".