2315809 has 4 divisors (see below), whose sum is σ = 2355120. Its totient is φ = 2276500.

The previous prime is 2315773. The next prime is 2315839. The reversal of 2315809 is 9085132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2315809 - 2²¹ = 218657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2315839) 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, 19567 + ... + 19684.

It is an arithmetic number, because the mean of its divisors is an integer number (588780).

2^2315809 is an apocalyptic number.

It is an amenable number.

2315809 is a deficient number, since it is larger than the sum of its proper divisors (39311).

2315809 is an equidigital number, since it uses as much as digits as its factorization.

2315809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39310.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2315809 is about 1521.7782361435. The cubic root of 2315809 is about 132.3023563341.

The spelling of 2315809 in words is "two million, three hundred fifteen thousand, eight hundred nine".