11511138 has 8 divisors (see below), whose sum is σ = 23022288. Its totient is φ = 3837044.

The previous prime is 11511133. The next prime is 11511139. The reversal of 11511138 is 83111511.

It is a happy number.

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

11511138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (11511133) 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, 959256 + ... + 959267.

It is an arithmetic number, because the mean of its divisors is an integer number (2877786).

Almost surely, 2^11511138 is an apocalyptic number.

11511138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11511138 is a wasteful number, since it uses less digits than its factorization.

11511138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918528.

The product of its digits is 120, while the sum is 21.

The square root of 11511138 is about 3392.8068026341. The cubic root of 11511138 is about 225.7907191492.

Adding to 11511138 its reverse (83111511), we get a palindrome (94622649).

The spelling of 11511138 in words is "eleven million, five hundred eleven thousand, one hundred thirty-eight".