11031111988 has 72 divisors (see below), whose sum is σ = 21851144280. Its totient is φ = 4864204800.

The previous prime is 11031111947. The next prime is 11031112003. The reversal of 11031111988 is 88911113011.

It can be written as a sum of positive squares in 12 ways, for example, as 2259291024 + 8771820964 = 47532^2 + 93658^2 .

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1898688 + ... + 1904488.

It is an arithmetic number, because the mean of its divisors is an integer number (303488115).

Almost surely, 2^11031111988 is an apocalyptic number.

It is an amenable number.

11031111988 is a deficient number, since it is larger than the sum of its proper divisors (10820032292).

11031111988 is a wasteful number, since it uses less digits than its factorization.

11031111988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957 (or 5942 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 34.

Adding to 11031111988 its reverse (88911113011), we get a palindrome (99942224999).

The spelling of 11031111988 in words is "eleven billion, thirty-one million, one hundred eleven thousand, nine hundred eighty-eight".