12521553 has 8 divisors (see below), whose sum is σ = 18213216. Its totient is φ = 7588800.

The previous prime is 12521543. The next prime is 12521569. The reversal of 12521553 is 35512521.

It is a happy number.

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

It is not a de Polignac number, because 12521553 - 2¹⁸ = 12259409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12521543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189688 + ... + 189753.

It is an arithmetic number, because the mean of its divisors is an integer number (2276652).

Almost surely, 2^12521553 is an apocalyptic number.

It is an amenable number.

12521553 is a deficient number, since it is larger than the sum of its proper divisors (5691663).

12521553 is a wasteful number, since it uses less digits than its factorization.

12521553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379455.

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

The square root of 12521553 is about 3538.5806476609. The cubic root of 12521553 is about 232.2127519758.

The spelling of 12521553 in words is "twelve million, five hundred twenty-one thousand, five hundred fifty-three".