11813491 has 2 divisors, whose sum is σ = 11813492. Its totient is φ = 11813490.

The previous prime is 11813489. The next prime is 11813509. The reversal of 11813491 is 19431811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11813491 - 2¹ = 11813489 is a prime.

Together with 11813489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11813401) 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, 5906745 + 5906746.

It is an arithmetic number, because the mean of its divisors is an integer number (5906746).

Almost surely, 2^11813491 is an apocalyptic number.

11813491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11813491 is an equidigital number, since it uses as much as digits as its factorization.

11813491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 11813491 is about 3437.0759374794. The cubic root of 11813491 is about 227.7505415161.

The spelling of 11813491 in words is "eleven million, eight hundred thirteen thousand, four hundred ninety-one".