3111809 has 2 divisors, whose sum is σ = 3111810. Its totient is φ = 3111808.

The previous prime is 3111803. The next prime is 3111817. The reversal of 3111809 is 9081113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2900209 + 211600 = 1703^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111809 - 2¹⁶ = 3046273 is a prime.

It is not a weakly prime, because it can be changed into another prime (3111803) 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, 1555904 + 1555905.

It is an arithmetic number, because the mean of its divisors is an integer number (1555905).

Almost surely, 2^3111809 is an apocalyptic number.

It is an amenable number.

3111809 is a deficient number, since it is larger than the sum of its proper divisors (1).

3111809 is an equidigital number, since it uses as much as digits as its factorization.

3111809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 3111809 is about 1764.0320291877. The cubic root of 3111809 is about 145.9948862911.

The spelling of 3111809 in words is "three million, one hundred eleven thousand, eight hundred nine".