1281105 has 48 divisors (see below), whose sum is σ = 2620800. Its totient is φ = 578592.

The previous prime is 1281101. The next prime is 1281131. The reversal of 1281105 is 5011821.

It is not a de Polignac number, because 1281105 - 2² = 1281101 is a prime.

1281105 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1281101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15394 + ... + 15476.

It is an arithmetic number, because the mean of its divisors is an integer number (54600).

2^1281105 is an apocalyptic number.

1281105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281105 is an abundant number, since it is smaller than the sum of its proper divisors (1339695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281105 is an equidigital number, since it uses as much as digits as its factorization.

1281105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1281105 is about 1131.8590901698. The cubic root of 1281105 is about 108.6079397551.

Adding to 1281105 its reverse (5011821), we get a palindrome (6292926).

The spelling of 1281105 in words is "one million, two hundred eighty-one thousand, one hundred five".