11906681 has 4 divisors (see below), whose sum is σ = 12607092. Its totient is φ = 11206272.

The previous prime is 11906677. The next prime is 11906689. The reversal of 11906681 is 18660911.

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 4910656 + 6996025 = 2216^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 11906681 - 2² = 11906677 is a prime.

It is a super-2 number, since 2×11906681² = 283538104871522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11906689) 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, 350180 + ... + 350213.

It is an arithmetic number, because the mean of its divisors is an integer number (3151773).

Almost surely, 2^11906681 is an apocalyptic number.

It is an amenable number.

11906681 is a deficient number, since it is larger than the sum of its proper divisors (700411).

11906681 is an equidigital number, since it uses as much as digits as its factorization.

11906681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700410.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 11906681 is about 3450.6058888259. The cubic root of 11906681 is about 228.3478390747.

The spelling of 11906681 in words is "eleven million, nine hundred six thousand, six hundred eighty-one".