56511023 has 4 divisors (see below), whose sum is σ = 58968048. Its totient is φ = 54054000.

The previous prime is 56511001. The next prime is 56511029. The reversal of 56511023 is 32011565.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56511023 - 2⁸ = 56510767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 2457001 = 56511023 / (5 + 6 + 5 + 1 + 1 + 0 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56511023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56511029) 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, 1228478 + ... + 1228523.

It is an arithmetic number, because the mean of its divisors is an integer number (14742012).

Almost surely, 2^56511023 is an apocalyptic number.

56511023 is a deficient number, since it is larger than the sum of its proper divisors (2457025).

56511023 is a wasteful number, since it uses less digits than its factorization.

56511023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457024.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 56511023 is about 7517.3813924797. The cubic root of 56511023 is about 383.7464666674.

Adding to 56511023 its reverse (32011565), we get a palindrome (88522588).

The spelling of 56511023 in words is "fifty-six million, five hundred eleven thousand, twenty-three".