11912891 has 2 divisors, whose sum is σ = 11912892. Its totient is φ = 11912890.

The previous prime is 11912851. The next prime is 11912899. The reversal of 11912891 is 19821911.

11912891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11912891 - 2²² = 7718587 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11912899) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5956445 + 5956446.

It is an arithmetic number, because the mean of its divisors is an integer number (5956446).

Almost surely, 2^11912891 is an apocalyptic number.

11912891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11912891 is an equidigital number, since it uses as much as digits as its factorization.

11912891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 32.

The square root of 11912891 is about 3451.5056134968. The cubic root of 11912891 is about 228.3875308976.

The spelling of 11912891 in words is "eleven million, nine hundred twelve thousand, eight hundred ninety-one".