56285821 has 4 divisors (see below), whose sum is σ = 56300832. Its totient is φ = 56270812.

The previous prime is 56285819. The next prime is 56285857. The reversal of 56285821 is 12858265.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 56285821 - 2¹ = 56285819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56285881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3456 + ... + 11158.

It is an arithmetic number, because the mean of its divisors is an integer number (14075208).

Almost surely, 2^56285821 is an apocalyptic number.

It is an amenable number.

56285821 is a deficient number, since it is larger than the sum of its proper divisors (15011).

56285821 is an equidigital number, since it uses as much as digits as its factorization.

56285821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15010.

The product of its digits is 38400, while the sum is 37.

The square root of 56285821 is about 7502.3876865968. The cubic root of 56285821 is about 383.2360321830.

It can be divided in two parts, 5628 and 5821, that added together give a square (11449 = 107²).

The spelling of 56285821 in words is "fifty-six million, two hundred eighty-five thousand, eight hundred twenty-one".