11499991 has 2 divisors, whose sum is σ = 11499992. Its totient is φ = 11499990.

The previous prime is 11499989. The next prime is 11500001. The reversal of 11499991 is 19999411.

11499991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19999411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11499991 - 2¹ = 11499989 is a prime.

Together with 11499989, 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 (11499911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5749995 + 5749996.

It is an arithmetic number, because the mean of its divisors is an integer number (5749996).

Almost surely, 2^11499991 is an apocalyptic number.

11499991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11499991 is an equidigital number, since it uses as much as digits as its factorization.

11499991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 43.

The square root of 11499991 is about 3391.1636645848. The cubic root of 11499991 is about 225.7178128908.

The spelling of 11499991 in words is "eleven million, four hundred ninety-nine thousand, nine hundred ninety-one".