1131685 has 4 divisors (see below), whose sum is σ = 1358028. Its totient is φ = 905344.

The previous prime is 1131677. The next prime is 1131701. The reversal of 1131685 is 5861311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 298116 + 833569 = 546^2 + 913^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131685 - 2³ = 1131677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113164 + ... + 113173.

It is an arithmetic number, because the mean of its divisors is an integer number (339507).

2^1131685 is an apocalyptic number.

It is an amenable number.

1131685 is a deficient number, since it is larger than the sum of its proper divisors (226343).

1131685 is an equidigital number, since it uses as much as digits as its factorization.

1131685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226342.

The product of its digits is 720, while the sum is 25.

The square root of 1131685 is about 1063.8068433696. The cubic root of 1131685 is about 104.2097897898.

Adding to 1131685 its reverse (5861311), we get a palindrome (6992996).

The spelling of 1131685 in words is "one million, one hundred thirty-one thousand, six hundred eighty-five".