56441821 has 2 divisors, whose sum is σ = 56441822. Its totient is φ = 56441820.

The previous prime is 56441809. The next prime is 56441851. The reversal of 56441821 is 12814465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 11148921 = 6730^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 56441821 - 2²¹ = 54344669 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56441851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28220910 + 28220911.

It is an arithmetic number, because the mean of its divisors is an integer number (28220911).

Almost surely, 2^56441821 is an apocalyptic number.

It is an amenable number.

56441821 is a deficient number, since it is larger than the sum of its proper divisors (1).

56441821 is an equidigital number, since it uses as much as digits as its factorization.

56441821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 31.

The square root of 56441821 is about 7512.7771829065. Note that the first 3 decimals coincide. The cubic root of 56441821 is about 383.5897605423.

The spelling of 56441821 in words is "fifty-six million, four hundred forty-one thousand, eight hundred twenty-one".