11636381 has 4 divisors (see below), whose sum is σ = 12320892. Its totient is φ = 10951872.

The previous prime is 11636353. The next prime is 11636423. The reversal of 11636381 is 18363611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18363611 = 7 ⋅2623373.

It can be written as a sum of positive squares in 2 ways, for example, as 8797156 + 2839225 = 2966^2 + 1685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11636381 is a prime.

It is a super-2 number, since 2×11636381² = 270810725554322, 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 (11636881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342230 + ... + 342263.

It is an arithmetic number, because the mean of its divisors is an integer number (3080223).

Almost surely, 2^11636381 is an apocalyptic number.

It is an amenable number.

11636381 is a deficient number, since it is larger than the sum of its proper divisors (684511).

11636381 is an equidigital number, since it uses as much as digits as its factorization.

11636381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684510.

The product of its digits is 2592, while the sum is 29.

The square root of 11636381 is about 3411.2140067724. The cubic root of 11636381 is about 226.6066466902.

Adding to 11636381 its reverse (18363611), we get a palindrome (29999992).

The spelling of 11636381 in words is "eleven million, six hundred thirty-six thousand, three hundred eighty-one".