12755581 has 2 divisors, whose sum is σ = 12755582. Its totient is φ = 12755580.

The previous prime is 12755579. The next prime is 12755591. The reversal of 12755581 is 18555721.

12755581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 1666681 = 3330^2 + 1291^2 .

It is a cyclic number.

It is not a de Polignac number, because 12755581 - 2¹ = 12755579 is a prime.

It is a super-2 number, since 2×12755581² = 325409693295122, which contains 22 as substring.

Together with 12755579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12755521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6377790 + 6377791.

It is an arithmetic number, because the mean of its divisors is an integer number (6377791).

Almost surely, 2^12755581 is an apocalyptic number.

It is an amenable number.

12755581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12755581 is an equidigital number, since it uses as much as digits as its factorization.

12755581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14000, while the sum is 34.

The square root of 12755581 is about 3571.4956250848. The cubic root of 12755581 is about 233.6505180685.

The spelling of 12755581 in words is "twelve million, seven hundred fifty-five thousand, five hundred eighty-one".