11993911 has 2 divisors, whose sum is σ = 11993912. Its totient is φ = 11993910.

The previous prime is 11993909. The next prime is 11993963. The reversal of 11993911 is 11939911.

It is a weak prime.

It is an emirp because it is prime and its reverse (11939911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11993911 - 2¹ = 11993909 is a prime.

Together with 11993909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11993411) 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, 5996955 + 5996956.

It is an arithmetic number, because the mean of its divisors is an integer number (5996956).

Almost surely, 2^11993911 is an apocalyptic number.

11993911 is a deficient number, since it is larger than the sum of its proper divisors (1).

11993911 is an equidigital number, since it uses as much as digits as its factorization.

11993911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 34.

The square root of 11993911 is about 3463.2226321737. Note that the first 3 decimals coincide. The cubic root of 11993911 is about 228.9041188202.

The spelling of 11993911 in words is "eleven million, nine hundred ninety-three thousand, nine hundred eleven".