12657521 has 8 divisors (see below), whose sum is σ = 13253760. Its totient is φ = 12065152.

The previous prime is 12657499. The next prime is 12657527. The reversal of 12657521 is 12575621.

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

It is a cyclic number.

It is not a de Polignac number, because 12657521 - 2⁶ = 12657457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12657527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7340 + ... + 8898.

It is an arithmetic number, because the mean of its divisors is an integer number (1656720).

Almost surely, 2^12657521 is an apocalyptic number.

It is an amenable number.

12657521 is a deficient number, since it is larger than the sum of its proper divisors (596239).

12657521 is a wasteful number, since it uses less digits than its factorization.

12657521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935.

The product of its digits is 4200, while the sum is 29.

The square root of 12657521 is about 3557.7409967562. The cubic root of 12657521 is about 233.0502387570.

The spelling of 12657521 in words is "twelve million, six hundred fifty-seven thousand, five hundred twenty-one".