11131989 has 16 divisors (see below), whose sum is σ = 16417344. Its totient is φ = 6652800.

The previous prime is 11131979. The next prime is 11131999. The reversal of 11131989 is 98913111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11131979) and next prime (11131999).

It is not a de Polignac number, because 11131989 - 2⁸ = 11131733 is a prime.

It is a super-2 number, since 2×11131989² = 247842358192242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131979) 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 15 ways as a sum of consecutive naturals, for example, 99 + ... + 4719.

It is an arithmetic number, because the mean of its divisors is an integer number (1026084).

Almost surely, 2^11131989 is an apocalyptic number.

It is an amenable number.

11131989 is a deficient number, since it is larger than the sum of its proper divisors (5285355).

11131989 is a wasteful number, since it uses less digits than its factorization.

11131989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708.

The product of its digits is 1944, while the sum is 33.

The square root of 11131989 is about 3336.4635469311. The cubic root of 11131989 is about 223.2839927138.

The spelling of 11131989 in words is "eleven million, one hundred thirty-one thousand, nine hundred eighty-nine".