2856109 has 4 divisors (see below), whose sum is σ = 2859516. Its totient is φ = 2852704.

The previous prime is 2856107. The next prime is 2856121. The reversal of 2856109 is 9016582.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9016582 = 2 ⋅4508291.

It can be written as a sum of positive squares in 2 ways, for example, as 2490084 + 366025 = 1578^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 2856109 - 2¹ = 2856107 is a prime.

It is a Smith number, since the sum of its digits (31) 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.

2856109 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2856107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537 + ... + 2449.

It is an arithmetic number, because the mean of its divisors is an integer number (714879).

2^2856109 is an apocalyptic number.

It is an amenable number.

2856109 is a deficient number, since it is larger than the sum of its proper divisors (3407).

2856109 is a wasteful number, since it uses less digits than its factorization.

2856109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3406.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2856109 is about 1690.0026627198. The cubic root of 2856109 is about 141.8812238273.

The spelling of 2856109 in words is "two million, eight hundred fifty-six thousand, one hundred nine".