1280109 has 16 divisors (see below), whose sum is σ = 1778112. Its totient is φ = 818688.

The previous prime is 1280107. The next prime is 1280113. The reversal of 1280109 is 9010821.

It is not a de Polignac number, because 1280109 - 2¹ = 1280107 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13149 + ... + 13245.

It is an arithmetic number, because the mean of its divisors is an integer number (111132).

2^1280109 is an apocalyptic number.

It is an amenable number.

1280109 is a deficient number, since it is larger than the sum of its proper divisors (498003).

1280109 is an equidigital number, since it uses as much as digits as its factorization.

1280109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1280109 is about 1131.4190205225. The cubic root of 1280109 is about 108.5797865713.

The spelling of 1280109 in words is "one million, two hundred eighty thousand, one hundred nine".