42569 has 2 divisors, whose sum is σ = 42570. Its totient is φ = 42568.

The previous prime is 42557. The next prime is 42571. The reversal of 42569 is 96524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35344 + 7225 = 188^2 + 85^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42569 is a prime.

It is a super-2 number, since 2×42569² = 3624239522, which contains 22 as substring.

Together with 42571, 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 (42509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21284 + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (21285).

2⁴²⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

42569 is a deficient number, since it is larger than the sum of its proper divisors (1).

42569 is an equidigital number, since it uses as much as digits as its factorization.

42569 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42569 is about 206.3225629930. The cubic root of 42569 is about 34.9165358158.

It can be divided in two parts, 425 and 69, that added together give a palindrome (494).

The spelling of 42569 in words is "forty-two thousand, five hundred sixty-nine".