1131112188 has 30 divisors (see below), whose sum is σ = 2956951536. Its totient is φ = 377037288.

The previous prime is 1131112181. The next prime is 1131112189. The reversal of 1131112188 is 8812111311.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131112181) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1745220 + ... + 1745867.

Almost surely, 2^1131112188 is an apocalyptic number.

1131112188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1131112188 is an abundant number, since it is smaller than the sum of its proper divisors (1825839348).

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

1131112188 is a wasteful number, since it uses less digits than its factorization.

1131112188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491103 (or 3491092 counting only the distinct ones).

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

The square root of 1131112188 is about 33632.0113582283. The cubic root of 1131112188 is about 1041.9220459831.

Adding to 1131112188 its reverse (8812111311), we get a palindrome (9943223499).

The spelling of 1131112188 in words is "one billion, one hundred thirty-one million, one hundred twelve thousand, one hundred eighty-eight".