11809013 has 4 divisors (see below), whose sum is σ = 12430560. Its totient is φ = 11187468.

The previous prime is 11809009. The next prime is 11809019. The reversal of 11809013 is 31090811.

11809013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31090811 = 307 ⋅101273.

It is a cyclic number.

It is not a de Polignac number, because 11809013 - 2² = 11809009 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11809013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11809019) 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, 310745 + ... + 310782.

It is an arithmetic number, because the mean of its divisors is an integer number (3107640).

Almost surely, 2^11809013 is an apocalyptic number.

It is an amenable number.

11809013 is a deficient number, since it is larger than the sum of its proper divisors (621547).

11809013 is an equidigital number, since it uses as much as digits as its factorization.

11809013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621546.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 11809013 is about 3436.4244499188. The cubic root of 11809013 is about 227.7217609799.

Adding to 11809013 its reverse (31090811), we get a palindrome (42899824).

The spelling of 11809013 in words is "eleven million, eight hundred nine thousand, thirteen".