1231085 has 4 divisors (see below), whose sum is σ = 1477308. Its totient is φ = 984864.

The previous prime is 1231073. The next prime is 1231091. The reversal of 1231085 is 5801321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5801321 = 587 ⋅9883.

It can be written as a sum of positive squares in 2 ways, for example, as 243049 + 988036 = 493^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231085 - 2⁸ = 1230829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123104 + ... + 123113.

It is an arithmetic number, because the mean of its divisors is an integer number (369327).

2^1231085 is an apocalyptic number.

It is an amenable number.

1231085 is a deficient number, since it is larger than the sum of its proper divisors (246223).

1231085 is an equidigital number, since it uses as much as digits as its factorization.

1231085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246222.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1231085 is about 1109.5426985925. The cubic root of 1231085 is about 107.1756221485.

The spelling of 1231085 in words is "one million, two hundred thirty-one thousand, eighty-five".