11689281 has 6 divisors (see below), whose sum is σ = 16884530. Its totient is φ = 7792848.

The previous prime is 11689277. The next prime is 11689303. The reversal of 11689281 is 18298611.

It can be written as a sum of positive squares in only one way, i.e., 8503056 + 3186225 = 2916^2 + 1785^2 .

It is not a de Polignac number, because 11689281 - 2² = 11689277 is a prime.

It is a super-2 number, since 2×11689281² = 273278580593922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11689211) 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 5 ways as a sum of consecutive naturals, for example, 649396 + ... + 649413.

Almost surely, 2^11689281 is an apocalyptic number.

It is an amenable number.

11689281 is a deficient number, since it is larger than the sum of its proper divisors (5195249).

11689281 is a wasteful number, since it uses less digits than its factorization.

11689281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298815 (or 1298812 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 11689281 is about 3418.9590521093. The cubic root of 11689281 is about 226.9495188127.

The spelling of 11689281 in words is "eleven million, six hundred eighty-nine thousand, two hundred eighty-one".