11612809 has 8 divisors (see below), whose sum is σ = 12647880. Its totient is φ = 10598016.

The previous prime is 11612803. The next prime is 11612837. The reversal of 11612809 is 90821611.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32400 + 11580409 = 180^2 + 3403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11612809 - 2³ = 11612801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11612801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3862 + ... + 6175.

It is an arithmetic number, because the mean of its divisors is an integer number (1580985).

Almost surely, 2^11612809 is an apocalyptic number.

It is an amenable number.

11612809 is a deficient number, since it is larger than the sum of its proper divisors (1035071).

11612809 is a wasteful number, since it uses less digits than its factorization.

11612809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139.

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

The square root of 11612809 is about 3407.7571803167. The cubic root of 11612809 is about 226.4535297037.

It can be divided in two parts, 11612 and 809, that added together give a palindrome (12421).

The spelling of 11612809 in words is "eleven million, six hundred twelve thousand, eight hundred nine".