1131788889 has 128 divisors (see below), whose sum is σ = 2287042560. Its totient is φ = 534988800.

The previous prime is 1131788873. The next prime is 1131788891. The reversal of 1131788889 is 9888871311.

It is not a de Polignac number, because 1131788889 - 2⁴ = 1131788873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131788809) 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 127 ways as a sum of consecutive naturals, for example, 1095117 + ... + 1096149.

It is an arithmetic number, because the mean of its divisors is an integer number (17867520).

Almost surely, 2^1131788889 is an apocalyptic number.

It is an amenable number.

1131788889 is an abundant number, since it is smaller than the sum of its proper divisors (1155253671).

1131788889 is a wasteful number, since it uses less digits than its factorization.

1131788889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108 (or 1102 counting only the distinct ones).

The product of its digits is 774144, while the sum is 54.

The square root of 1131788889 is about 33642.0702246458. The cubic root of 1131788889 is about 1042.1297852151.

The spelling of 1131788889 in words is "one billion, one hundred thirty-one million, seven hundred eighty-eight thousand, eight hundred eighty-nine".