1131285 has 16 divisors (see below), whose sum is σ = 1845504. Its totient is φ = 591552.

The previous prime is 1131271. The next prime is 1131307. The reversal of 1131285 is 5821311.

It is not a de Polignac number, because 1131285 - 2⁴ = 1131269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84 + ... + 1506.

It is an arithmetic number, because the mean of its divisors is an integer number (115344).

2^1131285 is an apocalyptic number.

1131285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131285 is a deficient number, since it is larger than the sum of its proper divisors (714219).

1131285 is a wasteful number, since it uses less digits than its factorization.

1131285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484.

The product of its digits is 240, while the sum is 21.

The square root of 1131285 is about 1063.6188226992. The cubic root of 1131285 is about 104.1975105107.

Adding to 1131285 its reverse (5821311), we get a palindrome (6952596).

The spelling of 1131285 in words is "one million, one hundred thirty-one thousand, two hundred eighty-five".