12181903 has 4 divisors (see below), whose sum is σ = 12270960. Its totient is φ = 12092848.

The previous prime is 12181867. The next prime is 12181909. The reversal of 12181903 is 30918121.

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 12181903 - 2⁹ = 12181391 is a prime.

It is a super-3 number, since 3×12181903³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44323 + ... + 44596.

It is an arithmetic number, because the mean of its divisors is an integer number (3067740).

Almost surely, 2^12181903 is an apocalyptic number.

12181903 is a deficient number, since it is larger than the sum of its proper divisors (89057).

12181903 is an equidigital number, since it uses as much as digits as its factorization.

12181903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89056.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 12181903 is about 3490.2582998970. The cubic root of 12181903 is about 230.0938684271.

The spelling of 12181903 in words is "twelve million, one hundred eighty-one thousand, nine hundred three".