56821801 has 2 divisors, whose sum is σ = 56821802. Its totient is φ = 56821800.

The previous prime is 56821789. The next prime is 56821811. The reversal of 56821801 is 10812865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55890576 + 931225 = 7476^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 56821801 - 2⁷ = 56821673 is a prime.

It is not a weakly prime, because it can be changed into another prime (56821811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28410900 + 28410901.

It is an arithmetic number, because the mean of its divisors is an integer number (28410901).

Almost surely, 2^56821801 is an apocalyptic number.

It is an amenable number.

56821801 is a deficient number, since it is larger than the sum of its proper divisors (1).

56821801 is an equidigital number, since it uses as much as digits as its factorization.

56821801 is an evil number, because the sum of its binary digits is even.

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

The square root of 56821801 is about 7538.0236799840. The cubic root of 56821801 is about 384.4486423863.

The spelling of 56821801 in words is "fifty-six million, eight hundred twenty-one thousand, eight hundred one".