1131605320 has 32 divisors (see below), whose sum is σ = 2559321720. Its totient is φ = 450293760.

The previous prime is 1131605311. The next prime is 1131605333. The reversal of 1131605320 is 235061311.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 711929124 + 419676196 = 26682^2 + 20486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1131605291 and 1131605300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65571 + ... + 81010.

Almost surely, 2^1131605320 is an apocalyptic number.

1131605320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131605320 is an abundant number, since it is smaller than the sum of its proper divisors (1427716400).

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

1131605320 is a wasteful number, since it uses less digits than its factorization.

1131605320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146785 (or 146781 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1131605320 is about 33639.3418484964. The cubic root of 1131605320 is about 1042.0734398819.

Adding to 1131605320 its reverse (235061311), we get a palindrome (1366666631).

The spelling of 1131605320 in words is "one billion, one hundred thirty-one million, six hundred five thousand, three hundred twenty".