11599681 has 4 divisors (see below), whose sum is σ = 11999700. Its totient is φ = 11199664.

The previous prime is 11599667. The next prime is 11599691. The reversal of 11599681 is 18699511.

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 7376656 + 4223025 = 2716^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 11599681 - 2¹⁵ = 11566913 is a prime.

It is a super-2 number, since 2×11599681² = 269105198603522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11599691) 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 3 ways as a sum of consecutive naturals, for example, 199966 + ... + 200023.

It is an arithmetic number, because the mean of its divisors is an integer number (2999925).

Almost surely, 2^11599681 is an apocalyptic number.

It is an amenable number.

11599681 is a deficient number, since it is larger than the sum of its proper divisors (400019).

11599681 is an equidigital number, since it uses as much as digits as its factorization.

11599681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400018.

The product of its digits is 19440, while the sum is 40.

The square root of 11599681 is about 3405.8304420508. The cubic root of 11599681 is about 226.3681641130.

The spelling of 11599681 in words is "eleven million, five hundred ninety-nine thousand, six hundred eighty-one".