11521523 has 4 divisors (see below), whose sum is σ = 12407808. Its totient is φ = 10635240.

The previous prime is 11521519. The next prime is 11521547. The reversal of 11521523 is 32512511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32512511 = 83 ⋅391717.

It is a cyclic number.

It is not a de Polignac number, because 11521523 - 2² = 11521519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11521495 and 11521504.

It is not an unprimeable number, because it can be changed into a prime (11521513) 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, 443123 + ... + 443148.

It is an arithmetic number, because the mean of its divisors is an integer number (3101952).

Almost surely, 2^11521523 is an apocalyptic number.

11521523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11521523 is a deficient number, since it is larger than the sum of its proper divisors (886285).

11521523 is an equidigital number, since it uses as much as digits as its factorization.

11521523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886284.

The product of its digits is 300, while the sum is 20.

The square root of 11521523 is about 3394.3369013697. The cubic root of 11521523 is about 225.8585992559.

The spelling of 11521523 in words is "eleven million, five hundred twenty-one thousand, five hundred twenty-three".