11216681 has 4 divisors (see below), whose sum is σ = 12819072. Its totient is φ = 9614292.

The previous prime is 11216659. The next prime is 11216683. The reversal of 11216681 is 18661211.

11216681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-11216681 is a prime.

It is a super-2 number, since 2×11216681² = 251627865311522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11216681.

It is not an unprimeable number, because it can be changed into a prime (11216683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801185 + ... + 801198.

It is an arithmetic number, because the mean of its divisors is an integer number (3204768).

Almost surely, 2^11216681 is an apocalyptic number.

It is an amenable number.

11216681 is a deficient number, since it is larger than the sum of its proper divisors (1602391).

11216681 is an equidigital number, since it uses as much as digits as its factorization.

11216681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602390.

The product of its digits is 576, while the sum is 26.

The square root of 11216681 is about 3349.1313799252. The cubic root of 11216681 is about 223.8488098066.

Adding to 11216681 its reverse (18661211), we get a palindrome (29877892).

The spelling of 11216681 in words is "eleven million, two hundred sixteen thousand, six hundred eighty-one".