11990681 has 4 divisors (see below), whose sum is σ = 12018192. Its totient is φ = 11963172.

The previous prime is 11990677. The next prime is 11990689. The reversal of 11990681 is 18609911.

11990681 is digitally balanced in base 3, 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 not a de Polignac number, because 11990681 - 2² = 11990677 is a prime.

It is a super-2 number, since 2×11990681² = 287552861687522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11990689) 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, 13091 + ... + 13976.

It is an arithmetic number, because the mean of its divisors is an integer number (3004548).

Almost surely, 2^11990681 is an apocalyptic number.

It is an amenable number.

11990681 is a deficient number, since it is larger than the sum of its proper divisors (27511).

11990681 is an equidigital number, since it uses as much as digits as its factorization.

11990681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27510.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 11990681 is about 3462.7562721046. The cubic root of 11990681 is about 228.8835687626.

The spelling of 11990681 in words is "eleven million, nine hundred ninety thousand, six hundred eighty-one".