12765521 has 8 divisors (see below), whose sum is σ = 13953024. Its totient is φ = 11626560.

The previous prime is 12765517. The next prime is 12765541. The reversal of 12765521 is 12556721.

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 12765521 - 2² = 12765517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12765541) 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, 11585 + ... + 12638.

It is an arithmetic number, because the mean of its divisors is an integer number (1744128).

Almost surely, 2^12765521 is an apocalyptic number.

It is an amenable number.

12765521 is a deficient number, since it is larger than the sum of its proper divisors (1187503).

12765521 is a wasteful number, since it uses less digits than its factorization.

12765521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24271.

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

The square root of 12765521 is about 3572.8869279618. The cubic root of 12765521 is about 233.7111943359.

The spelling of 12765521 in words is "twelve million, seven hundred sixty-five thousand, five hundred twenty-one".