11209523 has 8 divisors (see below), whose sum is σ = 12366816. Its totient is φ = 10094400.

The previous prime is 11209519. The next prime is 11209529. The reversal of 11209523 is 32590211.

11209523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11209523 - 2² = 11209519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11209529) 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, 9983 + ... + 11048.

It is an arithmetic number, because the mean of its divisors is an integer number (1545852).

Almost surely, 2^11209523 is an apocalyptic number.

11209523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11209523 is a deficient number, since it is larger than the sum of its proper divisors (1157293).

11209523 is a wasteful number, since it uses less digits than its factorization.

11209523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21085.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 11209523 is about 3348.0625740867. The cubic root of 11209523 is about 223.8011828022.

Adding to 11209523 its reverse (32590211), we get a palindrome (43799734).

The spelling of 11209523 in words is "eleven million, two hundred nine thousand, five hundred twenty-three".