420330551 has 2 divisors, whose sum is σ = 420330552. Its totient is φ = 420330550.

The previous prime is 420330539. The next prime is 420330571. The reversal of 420330551 is 155033024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420330551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420330511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210165275 + 210165276.

It is an arithmetic number, because the mean of its divisors is an integer number (210165276).

Almost surely, 2^420330551 is an apocalyptic number.

420330551 is a deficient number, since it is larger than the sum of its proper divisors (1).

420330551 is an equidigital number, since it uses as much as digits as its factorization.

420330551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 420330551 is about 20501.9645644021. The cubic root of 420330551 is about 749.0836518270.

Adding to 420330551 its reverse (155033024), we get a palindrome (575363575).

The spelling of 420330551 in words is "four hundred twenty million, three hundred thirty thousand, five hundred fifty-one".