11631213138 has 8 divisors (see below), whose sum is σ = 23262426288. Its totient is φ = 3877071044.

The previous prime is 11631213133. The next prime is 11631213173. The reversal of 11631213138 is 83131213611.

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

11631213138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (11631213133) 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, 969267756 + ... + 969267767.

It is an arithmetic number, because the mean of its divisors is an integer number (2907803286).

Almost surely, 2^11631213138 is an apocalyptic number.

11631213138 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.

11631213138 is a wasteful number, since it uses less digits than its factorization.

11631213138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938535528.

The product of its digits is 2592, while the sum is 30.

Adding to 11631213138 its reverse (83131213611), we get a palindrome (94762426749).

The spelling of 11631213138 in words is "eleven billion, six hundred thirty-one million, two hundred thirteen thousand, one hundred thirty-eight".