11111131005 has 16 divisors (see below), whose sum is σ = 19145333760. Its totient is φ = 5470095168.

The previous prime is 11111130991. The next prime is 11111131007. The reversal of 11111131005 is 50013111111.

It is not a de Polignac number, because 11111131005 - 2¹⁵ = 11111098237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111131007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28489885 + ... + 28490274.

It is an arithmetic number, because the mean of its divisors is an integer number (1196583360).

Almost surely, 2^11111131005 is an apocalyptic number.

11111131005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11111131005 is a deficient number, since it is larger than the sum of its proper divisors (8034202755).

11111131005 is a wasteful number, since it uses less digits than its factorization.

11111131005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56980180.

The product of its (nonzero) digits is 15, while the sum is 15.

Adding to 11111131005 its reverse (50013111111), we get a palindrome (61124242116).

The spelling of 11111131005 in words is "eleven billion, one hundred eleven million, one hundred thirty-one thousand, five".