420569 has 2 divisors, whose sum is σ = 420570. Its totient is φ = 420568.

The previous prime is 420557. The next prime is 420571. The reversal of 420569 is 965024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250000 + 170569 = 500^2 + 413^2 .

It is a cyclic number.

It is not a de Polignac number, because 420569 - 2⁸ = 420313 is a prime.

It is a super-2 number, since 2×420569² = 353756567522, which contains 22 as substring.

Together with 420571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210284 + 210285.

It is an arithmetic number, because the mean of its divisors is an integer number (210285).

2⁴²⁰⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

420569 is a deficient number, since it is larger than the sum of its proper divisors (1).

420569 is an equidigital number, since it uses as much as digits as its factorization.

420569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 420569 is about 648.5129142893. The cubic root of 420569 is about 74.9225274083.

It can be divided in two parts, 420 and 569, that added together give a palindrome (989).

The spelling of 420569 in words is "four hundred twenty thousand, five hundred sixty-nine".