18113503 has 2 divisors, whose sum is σ = 18113504. Its totient is φ = 18113502.

The previous prime is 18113467. The next prime is 18113509. The reversal of 18113503 is 30531181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18113503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18113509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9056751 + 9056752.

It is an arithmetic number, because the mean of its divisors is an integer number (9056752).

Almost surely, 2^18113503 is an apocalyptic number.

18113503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18113503 is an equidigital number, since it uses as much as digits as its factorization.

18113503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 18113503 is about 4255.9961231185. The cubic root of 18113503 is about 262.6238411876.

Adding to 18113503 its reverse (30531181), we get a palindrome (48644684).

The spelling of 18113503 in words is "eighteen million, one hundred thirteen thousand, five hundred three".