1131181380 has 144 divisors (see below), whose sum is σ = 3952865280. Its totient is φ = 256483584.

The previous prime is 1131181333. The next prime is 1131181417. The reversal of 1131181380 is 831811311.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156486 + ... + 163554.

Almost surely, 2^1131181380 is an apocalyptic number.

1131181380 is a gapful number since it is divisible by the number (10) 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 1131181380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1976432640).

1131181380 is an abundant number, since it is smaller than the sum of its proper divisors (2821683900).

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

1131181380 is a wasteful number, since it uses less digits than its factorization.

1131181380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7218 (or 7213 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1131181380 is about 33633.0400053281. The cubic root of 1131181380 is about 1041.9432909138.

Adding to 1131181380 its reverse (831811311), we get a palindrome (1962992691).

The spelling of 1131181380 in words is "one billion, one hundred thirty-one million, one hundred eighty-one thousand, three hundred eighty".