11919309 has 4 divisors (see below), whose sum is σ = 15892416. Its totient is φ = 7946204.

The previous prime is 11919301. The next prime is 11919311. The reversal of 11919309 is 90391911.

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 11919309 - 2³ = 11919301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11919309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11919301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1986549 + ... + 1986554.

It is an arithmetic number, because the mean of its divisors is an integer number (3973104).

Almost surely, 2^11919309 is an apocalyptic number.

It is an amenable number.

11919309 is a deficient number, since it is larger than the sum of its proper divisors (3973107).

11919309 is an equidigital number, since it uses as much as digits as its factorization.

11919309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973106.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 11919309 is about 3452.4352274880. The cubic root of 11919309 is about 228.4285376810.

The spelling of 11919309 in words is "eleven million, nine hundred nineteen thousand, three hundred nine".