11927891 has 2 divisors, whose sum is σ = 11927892. Its totient is φ = 11927890.

The previous prime is 11927873. The next prime is 11927893. The reversal of 11927891 is 19872911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11927891 - 2⁶ = 11927827 is a prime.

Together with 11927893, 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 (11927893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5963945 + 5963946.

It is an arithmetic number, because the mean of its divisors is an integer number (5963946).

Almost surely, 2^11927891 is an apocalyptic number.

11927891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11927891 is an equidigital number, since it uses as much as digits as its factorization.

11927891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 38.

The square root of 11927891 is about 3453.6778946509. The cubic root of 11927891 is about 228.4833480005.

The spelling of 11927891 in words is "eleven million, nine hundred twenty-seven thousand, eight hundred ninety-one".