12521551 has 16 divisors (see below), whose sum is σ = 15554560. Its totient is φ = 9836640.

The previous prime is 12521543. The next prime is 12521569. The reversal of 12521551 is 15512521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12521551 - 2³ = 12521543 is a prime.

It is a super-3 number, since 3×12521551³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521501) 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 15 ways as a sum of consecutive naturals, for example, 2605 + ... + 5641.

It is an arithmetic number, because the mean of its divisors is an integer number (972160).

Almost surely, 2^12521551 is an apocalyptic number.

12521551 is a deficient number, since it is larger than the sum of its proper divisors (3033009).

12521551 is a wasteful number, since it uses less digits than its factorization.

12521551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094.

The product of its digits is 500, while the sum is 22.

The square root of 12521551 is about 3538.5803650617. The cubic root of 12521551 is about 232.2127396125.

The spelling of 12521551 in words is "twelve million, five hundred twenty-one thousand, five hundred fifty-one".