11811887 has 2 divisors, whose sum is σ = 11811888. Its totient is φ = 11811886.

The previous prime is 11811883. The next prime is 11811913. The reversal of 11811887 is 78811811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11811887 - 2² = 11811883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11811883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905943 + 5905944.

It is an arithmetic number, because the mean of its divisors is an integer number (5905944).

Almost surely, 2^11811887 is an apocalyptic number.

11811887 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811887 is an equidigital number, since it uses as much as digits as its factorization.

11811887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 35.

The square root of 11811887 is about 3436.8425916821. The cubic root of 11811887 is about 227.7402332902.

The spelling of 11811887 in words is "eleven million, eight hundred eleven thousand, eight hundred eighty-seven".