1285133 has 4 divisors (see below), whose sum is σ = 1287420. Its totient is φ = 1282848.

The previous prime is 1285129. The next prime is 1285139. The reversal of 1285133 is 3315821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3315821 = 557 ⋅5953.

It can be written as a sum of positive squares in 2 ways, for example, as 1075369 + 209764 = 1037^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285133 - 2² = 1285129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1285099 and 1285108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (321855).

2^1285133 is an apocalyptic number.

It is an amenable number.

1285133 is a deficient number, since it is larger than the sum of its proper divisors (2287).

1285133 is an equidigital number, since it uses as much as digits as its factorization.

1285133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286.

The product of its digits is 720, while the sum is 23.

The square root of 1285133 is about 1133.6370671427. The cubic root of 1285133 is about 108.7216476051.

The spelling of 1285133 in words is "one million, two hundred eighty-five thousand, one hundred thirty-three".