11812609 has 4 divisors (see below), whose sum is σ = 11828740. Its totient is φ = 11796480.

The previous prime is 11812607. The next prime is 11812621. The reversal of 11812609 is 90621811.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6906384 + 4906225 = 2628^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 11812609 - 2¹ = 11812607 is a prime.

It is a deceptive number, since it divides R_11812608.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11812601) 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 in 3 ways as a sum of consecutive naturals, for example, 6912 + ... + 8449.

It is an arithmetic number, because the mean of its divisors is an integer number (2957185).

Almost surely, 2^11812609 is an apocalyptic number.

It is an amenable number.

11812609 is a deficient number, since it is larger than the sum of its proper divisors (16131).

11812609 is an equidigital number, since it uses as much as digits as its factorization.

11812609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16130.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 11812609 is about 3436.9476283470. The cubic root of 11812609 is about 227.7448733926.

It can be divided in two parts, 11812 and 609, that added together give a palindrome (12421).

The spelling of 11812609 in words is "eleven million, eight hundred twelve thousand, six hundred nine".