11718681 has 16 divisors (see below), whose sum is σ = 16888704. Its totient is φ = 7185024.

The previous prime is 11718647. The next prime is 11718689. The reversal of 11718681 is 18681711.

It is not a de Polignac number, because 11718681 - 2¹⁴ = 11702297 is a prime.

It is a super-2 number, since 2×11718681² = 274654968759522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11718689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18685 + ... + 19301.

It is an arithmetic number, because the mean of its divisors is an integer number (1055544).

Almost surely, 2^11718681 is an apocalyptic number.

It is an amenable number.

11718681 is a deficient number, since it is larger than the sum of its proper divisors (5170023).

11718681 is a wasteful number, since it uses less digits than its factorization.

11718681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its digits is 2688, while the sum is 33.

The square root of 11718681 is about 3423.2559062974. The cubic root of 11718681 is about 227.1396283029.

The spelling of 11718681 in words is "eleven million, seven hundred eighteen thousand, six hundred eighty-one".