18125503 has 8 divisors (see below), whose sum is σ = 20194560. Its totient is φ = 16126680.

The previous prime is 18125477. The next prime is 18125507. The reversal of 18125503 is 30552181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18125503 - 2²¹ = 16028351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18125507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17013 + ... + 18046.

It is an arithmetic number, because the mean of its divisors is an integer number (2524320).

Almost surely, 2^18125503 is an apocalyptic number.

18125503 is a deficient number, since it is larger than the sum of its proper divisors (2069057).

18125503 is a wasteful number, since it uses less digits than its factorization.

18125503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35117.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 18125503 is about 4257.4056654258. The cubic root of 18125503 is about 262.6818235375.

Adding to 18125503 its reverse (30552181), we get a palindrome (48677684).

It can be divided in two parts, 18 and 125503, that added together give a palindrome (125521).

The spelling of 18125503 in words is "eighteen million, one hundred twenty-five thousand, five hundred three".