11471989 has 2 divisors, whose sum is σ = 11471990. Its totient is φ = 11471988.

The previous prime is 11471987. The next prime is 11472031. The reversal of 11471989 is 98917411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7700625 + 3771364 = 2775^2 + 1942^2 .

It is a cyclic number.

It is not a de Polignac number, because 11471989 - 2¹ = 11471987 is a prime.

It is a super-2 number, since 2×11471989² = 263213063232242, which contains 22 as substring.

Together with 11471987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11471987) 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, 5735994 + 5735995.

It is an arithmetic number, because the mean of its divisors is an integer number (5735995).

Almost surely, 2^11471989 is an apocalyptic number.

It is an amenable number.

11471989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11471989 is an equidigital number, since it uses as much as digits as its factorization.

11471989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 40.

The square root of 11471989 is about 3387.0324769627. The cubic root of 11471989 is about 225.5344594939.

It can be divided in two parts, 1147 and 1989, that added together give a square (3136 = 56²).

The spelling of 11471989 in words is "eleven million, four hundred seventy-one thousand, nine hundred eighty-nine".