1281085 has 8 divisors (see below), whose sum is σ = 1655640. Its totient is φ = 945984.

The previous prime is 1281083. The next prime is 1281089. The reversal of 1281085 is 5801821.

It can be written as a sum of positive squares in 4 ways, for example, as 22201 + 1258884 = 149^2 + 1122^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1281085 - 2¹ = 1281083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281083) 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 7 ways as a sum of consecutive naturals, for example, 9790 + ... + 9919.

It is an arithmetic number, because the mean of its divisors is an integer number (206955).

2^1281085 is an apocalyptic number.

It is an amenable number.

1281085 is a deficient number, since it is larger than the sum of its proper divisors (374555).

1281085 is a wasteful number, since it uses less digits than its factorization.

1281085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19727.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1281085 is about 1131.8502551133. The cubic root of 1281085 is about 108.6073745737.

The spelling of 1281085 in words is "one million, two hundred eighty-one thousand, eighty-five".