18056503 has 2 divisors, whose sum is σ = 18056504. Its totient is φ = 18056502.

The previous prime is 18056497. The next prime is 18056543. The reversal of 18056503 is 30565081.

It is a weak prime.

It is an emirp because it is prime and its reverse (30565081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18056503 - 2¹⁷ = 17925431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18056543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9028251 + 9028252.

It is an arithmetic number, because the mean of its divisors is an integer number (9028252).

Almost surely, 2^18056503 is an apocalyptic number.

18056503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18056503 is an equidigital number, since it uses as much as digits as its factorization.

18056503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 18056503 is about 4249.2944120171. The cubic root of 18056503 is about 262.3480747489.

The spelling of 18056503 in words is "eighteen million, fifty-six thousand, five hundred three".