11966981 has 8 divisors (see below), whose sum is σ = 12987744. Its totient is φ = 10960560.

The previous prime is 11966953. The next prime is 11966993. The reversal of 11966981 is 18966911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11966981 - 2⁶ = 11966917 is a prime.

It is a super-2 number, since 2×11966981² = 286417268508722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11966921) 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 7 ways as a sum of consecutive naturals, for example, 1811 + ... + 5216.

It is an arithmetic number, because the mean of its divisors is an integer number (1623468).

Almost surely, 2^11966981 is an apocalyptic number.

It is an amenable number.

11966981 is a deficient number, since it is larger than the sum of its proper divisors (1020763).

11966981 is a wasteful number, since it uses less digits than its factorization.

11966981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7171.

The product of its digits is 23328, while the sum is 41.

The square root of 11966981 is about 3459.3324500545. The cubic root of 11966981 is about 228.7326705098.

The spelling of 11966981 in words is "eleven million, nine hundred sixty-six thousand, nine hundred eighty-one".