566405921 has 2 divisors, whose sum is σ = 566405922. Its totient is φ = 566405920.

The previous prime is 566405909. The next prime is 566405947. The reversal of 566405921 is 129504665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508051600 + 58354321 = 22540^2 + 7639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566405921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (566405221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283202960 + 283202961.

It is an arithmetic number, because the mean of its divisors is an integer number (283202961).

Almost surely, 2^566405921 is an apocalyptic number.

It is an amenable number.

566405921 is a deficient number, since it is larger than the sum of its proper divisors (1).

566405921 is an equidigital number, since it uses as much as digits as its factorization.

566405921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 566405921 is about 23799.2840438531. The cubic root of 566405921 is about 827.3880833057.

The spelling of 566405921 in words is "five hundred sixty-six million, four hundred five thousand, nine hundred twenty-one".