420000551 has 2 divisors, whose sum is σ = 420000552. Its totient is φ = 420000550.

The previous prime is 420000457. The next prime is 420000563. The reversal of 420000551 is 155000024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420000551 - 2²⁶ = 352891687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420000151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210000275 + 210000276.

It is an arithmetic number, because the mean of its divisors is an integer number (210000276).

Almost surely, 2^420000551 is an apocalyptic number.

420000551 is a deficient number, since it is larger than the sum of its proper divisors (1).

420000551 is an equidigital number, since it uses as much as digits as its factorization.

420000551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 420000551 is about 20493.9149749383. The cubic root of 420000551 is about 748.8875662113.

Adding to 420000551 its reverse (155000024), we get a palindrome (575000575).

The spelling of 420000551 in words is "four hundred twenty million, five hundred fifty-one", and thus it is an aban number.