11638191 has 4 divisors (see below), whose sum is σ = 15517592. Its totient is φ = 7758792.

The previous prime is 11638181. The next prime is 11638199. The reversal of 11638191 is 19183611.

11638191 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.

It is not a de Polignac number, because 11638191 - 2¹³ = 11629999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11638199) 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, 1939696 + ... + 1939701.

It is an arithmetic number, because the mean of its divisors is an integer number (3879398).

Almost surely, 2^11638191 is an apocalyptic number.

11638191 is a deficient number, since it is larger than the sum of its proper divisors (3879401).

11638191 is an equidigital number, since it uses as much as digits as its factorization.

11638191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879400.

The product of its digits is 1296, while the sum is 30.

The square root of 11638191 is about 3411.4792979000. The cubic root of 11638191 is about 226.6183953821.

The spelling of 11638191 in words is "eleven million, six hundred thirty-eight thousand, one hundred ninety-one".