2813809 has 2 divisors, whose sum is σ = 2813810. Its totient is φ = 2813808.

The previous prime is 2813807. The next prime is 2813819. The reversal of 2813809 is 9083182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2795584 + 18225 = 1672^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2813809 - 2¹ = 2813807 is a prime.

Together with 2813807, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2813807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1406904 + 1406905.

It is an arithmetic number, because the mean of its divisors is an integer number (1406905).

2^2813809 is an apocalyptic number.

It is an amenable number.

2813809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2813809 is an equidigital number, since it uses as much as digits as its factorization.

2813809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 2813809 is about 1677.4412061232. The cubic root of 2813809 is about 141.1772998896.

The spelling of 2813809 in words is "two million, eight hundred thirteen thousand, eight hundred nine".