56503 has 2 divisors, whose sum is σ = 56504. Its totient is φ = 56502.

The previous prime is 56501. The next prime is 56509. The reversal of 56503 is 30565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56503 - 2¹ = 56501 is a prime.

Together with 56501, it forms a pair of twin primes.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28251 + 28252.

It is an arithmetic number, because the mean of its divisors is an integer number (28252).

2⁵⁶⁵⁰³ is an apocalyptic number.

56503 is a deficient number, since it is larger than the sum of its proper divisors (1).

56503 is an equidigital number, since it uses as much as digits as its factorization.

56503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 56503 is about 237.7035969438. The cubic root of 56503 is about 38.3728305352.

Adding to 56503 its product of nonzero digits (450), we get a triangular number (56953 = T₃₃₇).

The spelling of 56503 in words is "fifty-six thousand, five hundred three".