1281117 has 4 divisors (see below), whose sum is σ = 1708160. Its totient is φ = 854076.

The previous prime is 1281101. The next prime is 1281131. The reversal of 1281117 is 7111821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7111821 = 3 ⋅2370607.

It is not a de Polignac number, because 1281117 - 2⁴ = 1281101 is a prime.

It is a D-number.

It is a Duffinian number.

1281117 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1281093 and 1281102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281157) 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 3 ways as a sum of consecutive naturals, for example, 213517 + ... + 213522.

It is an arithmetic number, because the mean of its divisors is an integer number (427040).

2^1281117 is an apocalyptic number.

It is an amenable number.

1281117 is a deficient number, since it is larger than the sum of its proper divisors (427043).

1281117 is an equidigital number, since it uses as much as digits as its factorization.

1281117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427042.

The product of its digits is 112, while the sum is 21.

The square root of 1281117 is about 1131.8643911706. The cubic root of 1281117 is about 108.6082788611.

Adding to 1281117 its reverse (7111821), we get a palindrome (8392938).

The spelling of 1281117 in words is "one million, two hundred eighty-one thousand, one hundred seventeen".