423020551 has 2 divisors, whose sum is σ = 423020552. Its totient is φ = 423020550.

The previous prime is 423020467. The next prime is 423020557. The reversal of 423020551 is 155020324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423020551 - 2¹⁵ = 422987783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423020557) 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, 211510275 + 211510276.

It is an arithmetic number, because the mean of its divisors is an integer number (211510276).

Almost surely, 2^423020551 is an apocalyptic number.

423020551 is a deficient number, since it is larger than the sum of its proper divisors (1).

423020551 is an equidigital number, since it uses as much as digits as its factorization.

423020551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 423020551 is about 20567.4634070417. The cubic root of 423020551 is about 750.6782315215.

Adding to 423020551 its reverse (155020324), we get a palindrome (578040875).

The spelling of 423020551 in words is "four hundred twenty-three million, twenty thousand, five hundred fifty-one".