11536981 has 4 divisors (see below), whose sum is σ = 11666700. Its totient is φ = 11407264.

The previous prime is 11536979. The next prime is 11536997. The reversal of 11536981 is 18963511.

11536981 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 an emirpimes, since its reverse is a distinct semiprime: 18963511 = 7 ⋅2709073.

It can be written as a sum of positive squares in 2 ways, for example, as 1136356 + 10400625 = 1066^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 11536981 - 2¹ = 11536979 is a prime.

It is a super-3 number, since 3×11536981³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11536951) 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, 64726 + ... + 64903.

It is an arithmetic number, because the mean of its divisors is an integer number (2916675).

Almost surely, 2^11536981 is an apocalyptic number.

It is an amenable number.

11536981 is a deficient number, since it is larger than the sum of its proper divisors (129719).

11536981 is an equidigital number, since it uses as much as digits as its factorization.

11536981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129718.

The product of its digits is 6480, while the sum is 34.

The square root of 11536981 is about 3396.6131660818. The cubic root of 11536981 is about 225.9595628177.

The spelling of 11536981 in words is "eleven million, five hundred thirty-six thousand, nine hundred eighty-one".