11261891 has 2 divisors, whose sum is σ = 11261892. Its totient is φ = 11261890.

The previous prime is 11261869. The next prime is 11261893. The reversal of 11261891 is 19816211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11261891 is a prime.

It is a Sophie Germain prime.

Together with 11261893, 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 (11261893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5630945 + 5630946.

It is an arithmetic number, because the mean of its divisors is an integer number (5630946).

Almost surely, 2^11261891 is an apocalyptic number.

11261891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11261891 is an equidigital number, since it uses as much as digits as its factorization.

11261891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 29.

The square root of 11261891 is about 3355.8741037172. The cubic root of 11261891 is about 224.1491552834.

The spelling of 11261891 in words is "eleven million, two hundred sixty-one thousand, eight hundred ninety-one".