11809523 has 4 divisors (see below), whose sum is σ = 12883128. Its totient is φ = 10735920.

The previous prime is 11809493. The next prime is 11809541. The reversal of 11809523 is 32590811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32590811 = 11 ⋅2962801.

It is a cyclic number.

It is not a de Polignac number, because 11809523 - 2¹⁸ = 11547379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11809573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536786 + ... + 536807.

It is an arithmetic number, because the mean of its divisors is an integer number (3220782).

Almost surely, 2^11809523 is an apocalyptic number.

11809523 is a deficient number, since it is larger than the sum of its proper divisors (1073605).

11809523 is a wasteful number, since it uses less digits than its factorization.

11809523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073604.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 11809523 is about 3436.4986541537. The cubic root of 11809523 is about 227.7250391660.

The spelling of 11809523 in words is "eleven million, eight hundred nine thousand, five hundred twenty-three".