11919491 has 2 divisors, whose sum is σ = 11919492. Its totient is φ = 11919490.

The previous prime is 11919473. The next prime is 11919511. The reversal of 11919491 is 19491911.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11919491 is a prime.

It is not a weakly prime, because it can be changed into another prime (11919421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5959745 + 5959746.

It is an arithmetic number, because the mean of its divisors is an integer number (5959746).

Almost surely, 2^11919491 is an apocalyptic number.

11919491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11919491 is an equidigital number, since it uses as much as digits as its factorization.

11919491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 35.

The square root of 11919491 is about 3452.4615855937. The cubic root of 11919491 is about 228.4297003262.

The spelling of 11919491 in words is "eleven million, nine hundred nineteen thousand, four hundred ninety-one".