11611989 has 12 divisors (see below), whose sum is σ = 16816800. Its totient is φ = 7721064.

The previous prime is 11611981. The next prime is 11612047. The reversal of 11611989 is 98911611.

It is not a de Polignac number, because 11611989 - 2³ = 11611981 is a prime.

It is a super-2 number, since 2×11611989² = 269676577072242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11611981) 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 11 ways as a sum of consecutive naturals, for example, 2482 + ... + 5420.

It is an arithmetic number, because the mean of its divisors is an integer number (1401400).

Almost surely, 2^11611989 is an apocalyptic number.

It is an amenable number.

11611989 is a deficient number, since it is larger than the sum of its proper divisors (5204811).

11611989 is a wasteful number, since it uses less digits than its factorization.

11611989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384 (or 3381 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 11611989 is about 3407.6368644561. The cubic root of 11611989 is about 226.4481994899.

The spelling of 11611989 in words is "eleven million, six hundred eleven thousand, nine hundred eighty-nine".