551220503 has 2 divisors, whose sum is σ = 551220504. Its totient is φ = 551220502.

The previous prime is 551220497. The next prime is 551220541. The reversal of 551220503 is 305022155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551220503 - 2¹⁰ = 551219479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551220403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275610251 + 275610252.

It is an arithmetic number, because the mean of its divisors is an integer number (275610252).

Almost surely, 2^551220503 is an apocalyptic number.

551220503 is a deficient number, since it is larger than the sum of its proper divisors (1).

551220503 is an equidigital number, since it uses as much as digits as its factorization.

551220503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 551220503 is about 23478.0855906098. The cubic root of 551220503 is about 819.9268738081.

Adding to 551220503 its reverse (305022155), we get a palindrome (856242658).

The spelling of 551220503 in words is "five hundred fifty-one million, two hundred twenty thousand, five hundred three".