11471987 has 2 divisors, whose sum is σ = 11471988. Its totient is φ = 11471986.

The previous prime is 11471959. The next prime is 11471989. The reversal of 11471987 is 78917411.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11471987 - 2¹⁸ = 11209843 is a prime.

Together with 11471989, 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 11471987.

It is not a weakly prime, because it can be changed into another prime (11471989) 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, 5735993 + 5735994.

It is an arithmetic number, because the mean of its divisors is an integer number (5735994).

Almost surely, 2^11471987 is an apocalyptic number.

11471987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11471987 is an equidigital number, since it uses as much as digits as its factorization.

11471987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 38.

The square root of 11471987 is about 3387.0321817190. The cubic root of 11471987 is about 225.5344463876.

The spelling of 11471987 in words is "eleven million, four hundred seventy-one thousand, nine hundred eighty-seven".