11315809 has 2 divisors, whose sum is σ = 11315810. Its totient is φ = 11315808.

The previous prime is 11315807. The next prime is 11315813. The reversal of 11315809 is 90851311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10112400 + 1203409 = 3180^2 + 1097^2 .

It is a cyclic number.

It is not a de Polignac number, because 11315809 - 2¹ = 11315807 is a prime.

Together with 11315807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11315807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5657904 + 5657905.

It is an arithmetic number, because the mean of its divisors is an integer number (5657905).

Almost surely, 2^11315809 is an apocalyptic number.

It is an amenable number.

11315809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11315809 is an equidigital number, since it uses as much as digits as its factorization.

11315809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 11315809 is about 3363.8978878676. The cubic root of 11315809 is about 224.5063018752.

The spelling of 11315809 in words is "eleven million, three hundred fifteen thousand, eight hundred nine".