1131985 has 4 divisors (see below), whose sum is σ = 1358388. Its totient is φ = 905584.

The previous prime is 1131973. The next prime is 1131997. The reversal of 1131985 is 5891311.

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

It is an interprime number because it is at equal distance from previous prime (1131973) and next prime (1131997).

It can be written as a sum of positive squares in 2 ways, for example, as 254016 + 877969 = 504^2 + 937^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131985 - 2⁷ = 1131857 is a prime.

It is an Ulam number.

It is a Duffinian 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, 113194 + ... + 113203.

It is an arithmetic number, because the mean of its divisors is an integer number (339597).

2^1131985 is an apocalyptic number.

It is an amenable number.

1131985 is a deficient number, since it is larger than the sum of its proper divisors (226403).

1131985 is an equidigital number, since it uses as much as digits as its factorization.

1131985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226402.

The product of its digits is 1080, while the sum is 28.

The square root of 1131985 is about 1063.9478370672. The cubic root of 1131985 is about 104.2189973504.

It can be divided in two parts, 1131 and 985, that added together give a square (2116 = 46²).

The spelling of 1131985 in words is "one million, one hundred thirty-one thousand, nine hundred eighty-five".