2809117 has 2 divisors, whose sum is σ = 2809118. Its totient is φ = 2809116.

The previous prime is 2809099. The next prime is 2809141. The reversal of 2809117 is 7119082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2627641 + 181476 = 1621^2 + 426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2809117 is a prime.

It is a super-2 number, since 2×2809117² = 15782276639378, which contains 22 as substring.

2809117 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2809187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404558 + 1404559.

It is an arithmetic number, because the mean of its divisors is an integer number (1404559).

2^2809117 is an apocalyptic number.

It is an amenable number.

2809117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809117 is an equidigital number, since it uses as much as digits as its factorization.

2809117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2809117 is about 1676.0420639113. The cubic root of 2809117 is about 141.0987856269.

It can be divided in two parts, 2809 and 117, that added together give a triangular number (2926 = T₇₆).

The spelling of 2809117 in words is "two million, eight hundred nine thousand, one hundred seventeen".