11611689 has 4 divisors (see below), whose sum is σ = 15482256. Its totient is φ = 7741124.

The previous prime is 11611681. The next prime is 11611727. The reversal of 11611689 is 98611611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11611689 - 2³ = 11611681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11611681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1935279 + ... + 1935284.

It is an arithmetic number, because the mean of its divisors is an integer number (3870564).

Almost surely, 2^11611689 is an apocalyptic number.

It is an amenable number.

11611689 is a deficient number, since it is larger than the sum of its proper divisors (3870567).

11611689 is an equidigital number, since it uses as much as digits as its factorization.

11611689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870566.

The product of its digits is 2592, while the sum is 33.

The square root of 11611689 is about 3407.5928453969. The cubic root of 11611689 is about 226.4462493490.

It can be divided in two parts, 1161 and 1689, that added together give a triangular number (2850 = T₇₅).

The spelling of 11611689 in words is "eleven million, six hundred eleven thousand, six hundred eighty-nine".