11864681 has 4 divisors (see below), whose sum is σ = 11894100. Its totient is φ = 11835264.

The previous prime is 11864669. The next prime is 11864687. The reversal of 11864681 is 18646811.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6295081 + 5569600 = 2509^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 11864681 - 2¹⁴ = 11848297 is a prime.

It is a super-2 number, since 2×11864681² = 281541310463522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11864687) 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, 14096 + ... + 14913.

It is an arithmetic number, because the mean of its divisors is an integer number (2973525).

Almost surely, 2^11864681 is an apocalyptic number.

It is an amenable number.

11864681 is a deficient number, since it is larger than the sum of its proper divisors (29419).

11864681 is an equidigital number, since it uses as much as digits as its factorization.

11864681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29418.

The product of its digits is 9216, while the sum is 35.

The square root of 11864681 is about 3444.5146247331. The cubic root of 11864681 is about 228.0790289803.

The spelling of 11864681 in words is "eleven million, eight hundred sixty-four thousand, six hundred eighty-one".