11733681 has 4 divisors (see below), whose sum is σ = 15644912. Its totient is φ = 7822452.

The previous prime is 11733679. The next prime is 11733713. The reversal of 11733681 is 18633711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18633711 = 3 ⋅6211237.

It is not a de Polignac number, because 11733681 - 2¹ = 11733679 is a prime.

It is a super-2 number, since 2×11733681² = 275358539619522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11733641) 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, 1955611 + ... + 1955616.

It is an arithmetic number, because the mean of its divisors is an integer number (3911228).

Almost surely, 2^11733681 is an apocalyptic number.

It is an amenable number.

11733681 is a deficient number, since it is larger than the sum of its proper divisors (3911231).

11733681 is an equidigital number, since it uses as much as digits as its factorization.

11733681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911230.

The product of its digits is 3024, while the sum is 30.

The square root of 11733681 is about 3425.4461023347. The cubic root of 11733681 is about 227.2365004610.

Adding to 11733681 its sum of digits (30), we get a palindrome (11733711).

The spelling of 11733681 in words is "eleven million, seven hundred thirty-three thousand, six hundred eighty-one".