11311233138 has 24 divisors (see below), whose sum is σ = 25352765100. Its totient is φ = 3640396704.

The previous prime is 11311233137. The next prime is 11311233149. The reversal of 11311233138 is 83133211311.

It is a happy number.

11311233138 is a `hidden beast` number, since 11 + 311 + 2 + 331 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9559559529 + 1751673609 = 97773^2 + 41853^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11311233137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10833993 + ... + 10835036.

Almost surely, 2^11311233138 is an apocalyptic number.

11311233138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11311233138 is an abundant number, since it is smaller than the sum of its proper divisors (14041531962).

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

11311233138 is a wasteful number, since it uses less digits than its factorization.

11311233138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21669066 (or 21669063 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

Adding to 11311233138 its reverse (83133211311), we get a palindrome (94444444449).

The spelling of 11311233138 in words is "eleven billion, three hundred eleven million, two hundred thirty-three thousand, one hundred thirty-eight".