56801821 has 4 divisors (see below), whose sum is σ = 57178144. Its totient is φ = 56425500.

The previous prime is 56801819. The next prime is 56801831. The reversal of 56801821 is 12810865.

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.

It is a cyclic number.

It is not a de Polignac number, because 56801821 - 2¹ = 56801819 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 (56801831) 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, 187935 + ... + 188236.

It is an arithmetic number, because the mean of its divisors is an integer number (14294536).

Almost surely, 2^56801821 is an apocalyptic number.

It is an amenable number.

56801821 is a deficient number, since it is larger than the sum of its proper divisors (376323).

56801821 is a wasteful number, since it uses less digits than its factorization.

56801821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376322.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 56801821 is about 7536.6982824046. The cubic root of 56801821 is about 384.4035764420.

The spelling of 56801821 in words is "fifty-six million, eight hundred one thousand, eight hundred twenty-one".