1131309 has 12 divisors (see below), whose sum is σ = 1643356. Its totient is φ = 749952.

The previous prime is 1131307. The next prime is 1131323. The reversal of 1131309 is 9031311.

It can be written as a sum of positive squares in 2 ways, for example, as 455625 + 675684 = 675^2 + 822^2 .

It is not a de Polignac number, because 1131309 - 2¹ = 1131307 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1131291 and 1131300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2847 + ... + 3219.

2^1131309 is an apocalyptic number.

It is an amenable number.

1131309 is a deficient number, since it is larger than the sum of its proper divisors (512047).

1131309 is a wasteful number, since it uses less digits than its factorization.

1131309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 1131309 is about 1063.6301048767. The cubic root of 1131309 is about 104.1982473490.

The spelling of 1131309 in words is "one million, one hundred thirty-one thousand, three hundred nine".