1131392988 has 144 divisors (see below), whose sum is σ = 3309788160. Its totient is φ = 331452000.

The previous prime is 1131392987. The next prime is 1131392989. The reversal of 1131392988 is 8892931311.

It is an interprime number because it is at equal distance from previous prime (1131392987) and next prime (1131392989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131392987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1141173 + ... + 1142163.

It is an arithmetic number, because the mean of its divisors is an integer number (22984640).

Almost surely, 2^1131392988 is an apocalyptic number.

1131392988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131392988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654894080).

1131392988 is an abundant number, since it is smaller than the sum of its proper divisors (2178395172).

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

1131392988 is a wasteful number, since it uses less digits than its factorization.

1131392988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1038 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 1131392988 is about 33636.1856933868. The cubic root of 1131392988 is about 1042.0082583283.

The spelling of 1131392988 in words is "one billion, one hundred thirty-one million, three hundred ninety-two thousand, nine hundred eighty-eight".