11788891 has 2 divisors, whose sum is σ = 11788892. Its totient is φ = 11788890.

The previous prime is 11788883. The next prime is 11788901. The reversal of 11788891 is 19888711.

It is a weak prime.

It is an emirp because it is prime and its reverse (19888711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11788891 - 2³ = 11788883 is a prime.

It is not a weakly prime, because it can be changed into another prime (11788801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5894445 + 5894446.

It is an arithmetic number, because the mean of its divisors is an integer number (5894446).

Almost surely, 2^11788891 is an apocalyptic number.

11788891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11788891 is an equidigital number, since it uses as much as digits as its factorization.

11788891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 43.

The square root of 11788891 is about 3433.4954492470. The cubic root of 11788891 is about 227.5923450734.

The spelling of 11788891 in words is "eleven million, seven hundred eighty-eight thousand, eight hundred ninety-one".