12523521 has 4 divisors (see below), whose sum is σ = 16698032. Its totient is φ = 8349012.

The previous prime is 12523519. The next prime is 12523541. The reversal of 12523521 is 12532521.

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 not a de Polignac number, because 12523521 - 2¹ = 12523519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12523541) 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, 2087251 + ... + 2087256.

It is an arithmetic number, because the mean of its divisors is an integer number (4174508).

Almost surely, 2^12523521 is an apocalyptic number.

It is an amenable number.

12523521 is a deficient number, since it is larger than the sum of its proper divisors (4174511).

12523521 is an equidigital number, since it uses as much as digits as its factorization.

12523521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4174510.

The product of its digits is 600, while the sum is 21.

The square root of 12523521 is about 3538.8587143315. The cubic root of 12523521 is about 232.2249168874.

The spelling of 12523521 in words is "twelve million, five hundred twenty-three thousand, five hundred twenty-one".