427218569 has 2 divisors, whose sum is σ = 427218570. Its totient is φ = 427218568.

The previous prime is 427218541. The next prime is 427218581. The reversal of 427218569 is 965812724.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405015625 + 22202944 = 20125^2 + 4712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427218569 is a prime.

It is a super-2 number, since 2×427218569² = 365031411396815522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (427218269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213609284 + 213609285.

It is an arithmetic number, because the mean of its divisors is an integer number (213609285).

Almost surely, 2^427218569 is an apocalyptic number.

It is an amenable number.

427218569 is a deficient number, since it is larger than the sum of its proper divisors (1).

427218569 is an equidigital number, since it uses as much as digits as its factorization.

427218569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 427218569 is about 20669.2662908000. The cubic root of 427218569 is about 753.1532832339.

The spelling of 427218569 in words is "four hundred twenty-seven million, two hundred eighteen thousand, five hundred sixty-nine".