56111531 has 8 divisors (see below), whose sum is σ = 64220160. Its totient is φ = 48026088.

The previous prime is 56111507. The next prime is 56111533. The reversal of 56111531 is 13511165.

56111531 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 a de Polignac number, because none of the positive numbers 2^k-56111531 is a prime.

It is a super-2 number, since 2×56111531² = 6297007822327922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56111497 and 56111506.

It is not an unprimeable number, because it can be changed into a prime (56111533) 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 7 ways as a sum of consecutive naturals, for example, 251 + ... + 10596.

It is an arithmetic number, because the mean of its divisors is an integer number (8027520).

Almost surely, 2^56111531 is an apocalyptic number.

56111531 is a deficient number, since it is larger than the sum of its proper divisors (8108629).

56111531 is a wasteful number, since it uses less digits than its factorization.

56111531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11593.

The product of its digits is 450, while the sum is 23.

The square root of 56111531 is about 7490.7630452445. The cubic root of 56111531 is about 382.8400575614.

Adding to 56111531 its reverse (13511165), we get a palindrome (69622696).

The spelling of 56111531 in words is "fifty-six million, one hundred eleven thousand, five hundred thirty-one".