12755521 has 2 divisors, whose sum is σ = 12755522. Its totient is φ = 12755520.

The previous prime is 12755497. The next prime is 12755537. The reversal of 12755521 is 12555721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 505521 = 3500^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 12755521 - 2⁵ = 12755489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12755521.

It is not a weakly prime, because it can be changed into another prime (12755581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6377760 + 6377761.

It is an arithmetic number, because the mean of its divisors is an integer number (6377761).

Almost surely, 2^12755521 is an apocalyptic number.

It is an amenable number.

12755521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12755521 is an equidigital number, since it uses as much as digits as its factorization.

12755521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3500, while the sum is 28.

The square root of 12755521 is about 3571.4872252326. The cubic root of 12755521 is about 233.6501517177.

The spelling of 12755521 in words is "twelve million, seven hundred fifty-five thousand, five hundred twenty-one".