11821903 has 2 divisors, whose sum is σ = 11821904. Its totient is φ = 11821902.

The previous prime is 11821891. The next prime is 11821913. The reversal of 11821903 is 30912811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11821903 - 2⁵ = 11821871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11821913) 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 as a sum of consecutive naturals, namely, 5910951 + 5910952.

It is an arithmetic number, because the mean of its divisors is an integer number (5910952).

Almost surely, 2^11821903 is an apocalyptic number.

11821903 is a deficient number, since it is larger than the sum of its proper divisors (1).

11821903 is an equidigital number, since it uses as much as digits as its factorization.

11821903 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11821903 is about 3438.2994343134. The cubic root of 11821903 is about 227.8045865905.

The spelling of 11821903 in words is "eleven million, eight hundred twenty-one thousand, nine hundred three".