56557771 has 4 divisors (see below), whose sum is σ = 57873112. Its totient is φ = 55242432.

The previous prime is 56557769. The next prime is 56557789. The reversal of 56557771 is 17775565.

56557771 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: 17775565 = 5 ⋅3555113.

It is a cyclic number.

It is not a de Polignac number, because 56557771 - 2¹ = 56557769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1315297 = 56557771 / (5 + 6 + 5 + 5 + 7 + 7 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56557751) 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, 657606 + ... + 657691.

It is an arithmetic number, because the mean of its divisors is an integer number (14468278).

Almost surely, 2^56557771 is an apocalyptic number.

56557771 is a deficient number, since it is larger than the sum of its proper divisors (1315341).

56557771 is a wasteful number, since it uses less digits than its factorization.

56557771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315340.

The product of its digits is 257250, while the sum is 43.

The square root of 56557771 is about 7520.4900771160. The cubic root of 56557771 is about 383.8522539070.

The spelling of 56557771 in words is "fifty-six million, five hundred fifty-seven thousand, seven hundred seventy-one".