11981489 has 8 divisors (see below), whose sum is σ = 12936000. Its totient is φ = 11031696.

The previous prime is 11981443. The next prime is 11981587. The reversal of 11981489 is 98418911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-11981489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11981429) 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 in 7 ways as a sum of consecutive naturals, for example, 5564 + ... + 7410.

It is an arithmetic number, because the mean of its divisors is an integer number (1617000).

Almost surely, 2^11981489 is an apocalyptic number.

It is an amenable number.

11981489 is a deficient number, since it is larger than the sum of its proper divisors (954511).

11981489 is a wasteful number, since it uses less digits than its factorization.

11981489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359.

The product of its digits is 20736, while the sum is 41.

The square root of 11981489 is about 3461.4287512529. The cubic root of 11981489 is about 228.8250667864.

The spelling of 11981489 in words is "eleven million, nine hundred eighty-one thousand, four hundred eighty-nine".