11944991 has 2 divisors, whose sum is σ = 11944992. Its totient is φ = 11944990.

The previous prime is 11944979. The next prime is 11944993. The reversal of 11944991 is 19944911.

11944991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11944991 is a prime.

Together with 11944993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11944993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5972495 + 5972496.

It is an arithmetic number, because the mean of its divisors is an integer number (5972496).

Almost surely, 2^11944991 is an apocalyptic number.

11944991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11944991 is an equidigital number, since it uses as much as digits as its factorization.

11944991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 38.

The square root of 11944991 is about 3456.1526297315. The cubic root of 11944991 is about 228.5924815616.

The spelling of 11944991 in words is "eleven million, nine hundred forty-four thousand, nine hundred ninety-one".