12521651 has 4 divisors (see below), whose sum is σ = 12860112. Its totient is φ = 12183192.

The previous prime is 12521623. The next prime is 12521669. The reversal of 12521651 is 15612521.

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: 15612521 = 59 ⋅264619.

It is a cyclic number.

It is not a de Polignac number, because 12521651 - 2¹⁴ = 12505267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521351) 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 3 ways as a sum of consecutive naturals, for example, 169175 + ... + 169248.

It is an arithmetic number, because the mean of its divisors is an integer number (3215028).

Almost surely, 2^12521651 is an apocalyptic number.

12521651 is a deficient number, since it is larger than the sum of its proper divisors (338461).

12521651 is an equidigital number, since it uses as much as digits as its factorization.

12521651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338460.

The product of its digits is 600, while the sum is 23.

The square root of 12521651 is about 3538.5944949937. The cubic root of 12521651 is about 232.2133577790.

The spelling of 12521651 in words is "twelve million, five hundred twenty-one thousand, six hundred fifty-one".