56511011 has 4 divisors (see below), whose sum is σ = 56528832. Its totient is φ = 56493192.

The previous prime is 56511001. The next prime is 56511029. The reversal of 56511011 is 11011565.

56511011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11011565 = 5 ⋅2202313.

It is a cyclic number.

It is not a de Polignac number, because 56511011 - 2⁶ = 56510947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56511001) 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 3 ways as a sum of consecutive naturals, for example, 2720 + ... + 10973.

It is an arithmetic number, because the mean of its divisors is an integer number (14132208).

Almost surely, 2^56511011 is an apocalyptic number.

56511011 is a deficient number, since it is larger than the sum of its proper divisors (17821).

56511011 is a wasteful number, since it uses less digits than its factorization.

56511011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17820.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 56511011 is about 7517.3805943294. The cubic root of 56511011 is about 383.7464395048.

Adding to 56511011 its reverse (11011565), we get a palindrome (67522576).

The spelling of 56511011 in words is "fifty-six million, five hundred eleven thousand, eleven".