12523551 has 4 divisors (see below), whose sum is σ = 16698072. Its totient is φ = 8349032.

The previous prime is 12523549. The next prime is 12523559. The reversal of 12523551 is 15532521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12523551 - 2¹ = 12523549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12523559) 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, 2087256 + ... + 2087261.

It is an arithmetic number, because the mean of its divisors is an integer number (4174518).

Almost surely, 2^12523551 is an apocalyptic number.

12523551 is a deficient number, since it is larger than the sum of its proper divisors (4174521).

12523551 is an equidigital number, since it uses as much as digits as its factorization.

12523551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4174520.

The product of its digits is 1500, while the sum is 24.

The square root of 12523551 is about 3538.8629529836. The cubic root of 12523551 is about 232.2251023183.

The spelling of 12523551 in words is "twelve million, five hundred twenty-three thousand, five hundred fifty-one".