503420551 has 2 divisors, whose sum is σ = 503420552. Its totient is φ = 503420550.

The previous prime is 503420543. The next prime is 503420581. The reversal of 503420551 is 155024305.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 503420551 - 2³ = 503420543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (503420521) 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, 251710275 + 251710276.

It is an arithmetic number, because the mean of its divisors is an integer number (251710276).

Almost surely, 2^503420551 is an apocalyptic number.

503420551 is a deficient number, since it is larger than the sum of its proper divisors (1).

503420551 is an equidigital number, since it uses as much as digits as its factorization.

503420551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 503420551 is about 22437.0352542398. The cubic root of 503420551 is about 795.5063430487.

Adding to 503420551 its reverse (155024305), we get a palindrome (658444856).

The spelling of 503420551 in words is "five hundred three million, four hundred twenty thousand, five hundred fifty-one".