11693981 has 4 divisors (see below), whose sum is σ = 12593532. Its totient is φ = 10794432.

The previous prime is 11693963. The next prime is 11694013. The reversal of 11693981 is 18939611.

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 4268356 + 7425625 = 2066^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 11693981 - 2²² = 7499677 is a prime.

It is a super-2 number, since 2×11693981² = 273498383256722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11693581) 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, 449756 + ... + 449781.

It is an arithmetic number, because the mean of its divisors is an integer number (3148383).

Almost surely, 2^11693981 is an apocalyptic number.

It is an amenable number.

11693981 is a deficient number, since it is larger than the sum of its proper divisors (899551).

11693981 is an equidigital number, since it uses as much as digits as its factorization.

11693981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899550.

The product of its digits is 11664, while the sum is 38.

The square root of 11693981 is about 3419.6463267420. The cubic root of 11693981 is about 226.9799318555.

The spelling of 11693981 in words is "eleven million, six hundred ninety-three thousand, nine hundred eighty-one".