11509913 has 4 divisors (see below), whose sum is σ = 12010368. Its totient is φ = 11009460.

The previous prime is 11509909. The next prime is 11509921. The reversal of 11509913 is 31990511.

11509913 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.

It is a cyclic number.

It is not a de Polignac number, because 11509913 - 2² = 11509909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11509933) 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, 250193 + ... + 250238.

It is an arithmetic number, because the mean of its divisors is an integer number (3002592).

Almost surely, 2^11509913 is an apocalyptic number.

It is an amenable number.

11509913 is a deficient number, since it is larger than the sum of its proper divisors (500455).

11509913 is an equidigital number, since it uses as much as digits as its factorization.

11509913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500454.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 11509913 is about 3392.6262688366. The cubic root of 11509913 is about 225.7827094157.

The spelling of 11509913 in words is "eleven million, five hundred nine thousand, nine hundred thirteen".