18125603 has 2 divisors, whose sum is σ = 18125604. Its totient is φ = 18125602.

The previous prime is 18125573. The next prime is 18125617. The reversal of 18125603 is 30652181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18125603 - 2⁸ = 18125347 is a prime.

It is a super-2 number, since 2×18125603² = 657074968227218, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18125903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9062801 + 9062802.

It is an arithmetic number, because the mean of its divisors is an integer number (9062802).

Almost surely, 2^18125603 is an apocalyptic number.

18125603 is a deficient number, since it is larger than the sum of its proper divisors (1).

18125603 is an equidigital number, since it uses as much as digits as its factorization.

18125603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 18125603 is about 4257.4174096511. The cubic root of 18125603 is about 262.6823066162.

Adding to 18125603 its reverse (30652181), we get a palindrome (48777784).

The spelling of 18125603 in words is "eighteen million, one hundred twenty-five thousand, six hundred three".