424128569 has 2 divisors, whose sum is σ = 424128570. Its totient is φ = 424128568.

The previous prime is 424128553. The next prime is 424128571. The reversal of 424128569 is 965821424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409536169 + 14592400 = 20237^2 + 3820^2 .

It is a cyclic number.

It is not a de Polignac number, because 424128569 - 2⁴ = 424128553 is a prime.

It is a super-2 number, since 2×424128569² = 359770086083975522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 424128571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (424128599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212064284 + 212064285.

It is an arithmetic number, because the mean of its divisors is an integer number (212064285).

Almost surely, 2^424128569 is an apocalyptic number.

It is an amenable number.

424128569 is a deficient number, since it is larger than the sum of its proper divisors (1).

424128569 is an equidigital number, since it uses as much as digits as its factorization.

424128569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The square root of 424128569 is about 20594.3819766460. The cubic root of 424128569 is about 751.3330774319. Note that the first 3 decimals are identical.

The spelling of 424128569 in words is "four hundred twenty-four million, one hundred twenty-eight thousand, five hundred sixty-nine".