18361003 has 4 divisors (see below), whose sum is σ = 19441080. Its totient is φ = 17280928.

The previous prime is 18360997. The next prime is 18361051. The reversal of 18361003 is 30016381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18361003 - 2⁵ = 18360971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18331003) 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 in 3 ways as a sum of consecutive naturals, for example, 540013 + ... + 540046.

It is an arithmetic number, because the mean of its divisors is an integer number (4860270).

Almost surely, 2^18361003 is an apocalyptic number.

18361003 is a deficient number, since it is larger than the sum of its proper divisors (1080077).

18361003 is a wasteful number, since it uses less digits than its factorization.

18361003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080076.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 18361003 is about 4284.9740956043. The cubic root of 18361003 is about 263.8145841855.

Adding to 18361003 its reverse (30016381), we get a palindrome (48377384).

The spelling of 18361003 in words is "eighteen million, three hundred sixty-one thousand, three".