11811851 has 2 divisors, whose sum is σ = 11811852. Its totient is φ = 11811850.

The previous prime is 11811847. The next prime is 11811853. The reversal of 11811851 is 15811811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11811851 - 2² = 11811847 is a prime.

Together with 11811853, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11811851.

It is not a weakly prime, because it can be changed into another prime (11811853) 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, 5905925 + 5905926.

It is an arithmetic number, because the mean of its divisors is an integer number (5905926).

Almost surely, 2^11811851 is an apocalyptic number.

11811851 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811851 is an equidigital number, since it uses as much as digits as its factorization.

11811851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 26.

The square root of 11811851 is about 3436.8373543128. The cubic root of 11811851 is about 227.7400019228.

The spelling of 11811851 in words is "eleven million, eight hundred eleven thousand, eight hundred fifty-one".