420304331 has 2 divisors, whose sum is σ = 420304332. Its totient is φ = 420304330.

The previous prime is 420304321. The next prime is 420304361. The reversal of 420304331 is 133403024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420304331 - 2²⁶ = 353195467 is a prime.

It is a super-2 number, since 2×420304331² = 353311461314715122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420304321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210152165 + 210152166.

It is an arithmetic number, because the mean of its divisors is an integer number (210152166).

Almost surely, 2^420304331 is an apocalyptic number.

420304331 is a deficient number, since it is larger than the sum of its proper divisors (1).

420304331 is an equidigital number, since it uses as much as digits as its factorization.

420304331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 420304331 is about 20501.3251035147. The cubic root of 420304331 is about 749.0680756876.

Adding to 420304331 its reverse (133403024), we get a palindrome (553707355).

The spelling of 420304331 in words is "four hundred twenty million, three hundred four thousand, three hundred thirty-one".