1231285 has 16 divisors (see below), whose sum is σ = 1642752. Its totient is φ = 878400.

The previous prime is 1231283. The next prime is 1231301. The reversal of 1231285 is 5821321.

1231285 = T₃₀ + T₃₁ + ... + T₁₉₄.

It is not a de Polignac number, because 1231285 - 2¹ = 1231283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231283) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3172 + ... + 3538.

It is an arithmetic number, because the mean of its divisors is an integer number (102672).

2^1231285 is an apocalyptic number.

It is an amenable number.

1231285 is a deficient number, since it is larger than the sum of its proper divisors (411467).

1231285 is a wasteful number, since it uses less digits than its factorization.

1231285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444.

The product of its digits is 480, while the sum is 22.

The square root of 1231285 is about 1109.6328221533. The cubic root of 1231285 is about 107.1814256914.

The spelling of 1231285 in words is "one million, two hundred thirty-one thousand, two hundred eighty-five".