1281055 has 4 divisors (see below), whose sum is σ = 1537272. Its totient is φ = 1024840.

The previous prime is 1281047. The next prime is 1281083. The reversal of 1281055 is 5501821.

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

It is not a de Polignac number, because 1281055 - 2³ = 1281047 is a prime.

It is a super-2 number, since 2×1281055² = 3282203826050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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, 128101 + ... + 128110.

It is an arithmetic number, because the mean of its divisors is an integer number (384318).

2^1281055 is an apocalyptic number.

1281055 is a deficient number, since it is larger than the sum of its proper divisors (256217).

1281055 is an equidigital number, since it uses as much as digits as its factorization.

1281055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256216.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1281055 is about 1131.8370023992. The cubic root of 1281055 is about 108.6065267906.

Adding to 1281055 its reverse (5501821), we get a palindrome (6782876).

The spelling of 1281055 in words is "one million, two hundred eighty-one thousand, fifty-five".