1128181131 has 36 divisors (see below), whose sum is σ = 2047108336. Its totient is φ = 586064160.

The previous prime is 1128181123. The next prime is 1128181141. The reversal of 1128181131 is 1311818211.

It is not a de Polignac number, because 1128181131 - 2³ = 1128181123 is a prime.

It is a super-2 number, since 2×1128181131² = 2545585328688878322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1128181095 and 1128181104.

It is not an unprimeable number, because it can be changed into a prime (1128181141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 66376 + ... + 81621.

Almost surely, 2^1128181131 is an apocalyptic number.

1128181131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1128181131 is a deficient number, since it is larger than the sum of its proper divisors (918927205).

1128181131 is a wasteful number, since it uses less digits than its factorization.

1128181131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148032 (or 148018 counting only the distinct ones).

The product of its digits is 384, while the sum is 27.

The square root of 1128181131 is about 33588.4076877723. The cubic root of 1128181131 is about 1041.0212881173.

Adding to 1128181131 its reverse (1311818211), we get a palindrome (2439999342).

The spelling of 1128181131 in words is "one billion, one hundred twenty-eight million, one hundred eighty-one thousand, one hundred thirty-one".