566381021 has 2 divisors, whose sum is σ = 566381022. Its totient is φ = 566381020.

The previous prime is 566380999. The next prime is 566381063. The reversal of 566381021 is 120183665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489028996 + 77352025 = 22114^2 + 8795^2 .

It is a cyclic number.

It is not a de Polignac number, because 566381021 - 2¹⁸ = 566118877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566386021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283190510 + 283190511.

It is an arithmetic number, because the mean of its divisors is an integer number (283190511).

Almost surely, 2^566381021 is an apocalyptic number.

It is an amenable number.

566381021 is a deficient number, since it is larger than the sum of its proper divisors (1).

566381021 is an equidigital number, since it uses as much as digits as its factorization.

566381021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 566381021 is about 23798.7609131232. The cubic root of 566381021 is about 827.3759587472.

The spelling of 566381021 in words is "five hundred sixty-six million, three hundred eighty-one thousand, twenty-one".