1131550280 has 128 divisors (see below), whose sum is σ = 3007411200. Its totient is φ = 375072768.

The previous prime is 1131550229. The next prime is 1131550283. The reversal of 1131550280 is 820551311.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1131550283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2475812 + ... + 2476268.

It is an arithmetic number, because the mean of its divisors is an integer number (23495400).

Almost surely, 2^1131550280 is an apocalyptic number.

1131550280 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 1131550280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1503705600).

1131550280 is an abundant number, since it is smaller than the sum of its proper divisors (1875860920).

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

1131550280 is a wasteful number, since it uses less digits than its factorization.

1131550280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1131550280 is about 33638.5237488211. The cubic root of 1131550280 is about 1042.0565445177.

The spelling of 1131550280 in words is "one billion, one hundred thirty-one million, five hundred fifty thousand, two hundred eighty".