565522421 has 2 divisors, whose sum is σ = 565522422. Its totient is φ = 565522420.

The previous prime is 565522343. The next prime is 565522423. The reversal of 565522421 is 124225565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529690225 + 35832196 = 23015^2 + 5986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-565522421 is a prime.

It is a Sophie Germain prime.

Together with 565522423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (565522423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282761210 + 282761211.

It is an arithmetic number, because the mean of its divisors is an integer number (282761211).

Almost surely, 2^565522421 is an apocalyptic number.

It is an amenable number.

565522421 is a deficient number, since it is larger than the sum of its proper divisors (1).

565522421 is an equidigital number, since it uses as much as digits as its factorization.

565522421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 32.

The square root of 565522421 is about 23780.7153172481. The cubic root of 565522421 is about 826.9576630289.

Adding to 565522421 its reverse (124225565), we get a palindrome (689747986).

The spelling of 565522421 in words is "five hundred sixty-five million, five hundred twenty-two thousand, four hundred twenty-one".