12891601 has 2 divisors, whose sum is σ = 12891602. Its totient is φ = 12891600.

The previous prime is 12891587. The next prime is 12891607. The reversal of 12891601 is 10619821.

It is a happy number.

12891601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 641601 = 3500^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 12891601 - 2²¹ = 10794449 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12891601.

It is not a weakly prime, because it can be changed into another prime (12891607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445800 + 6445801.

It is an arithmetic number, because the mean of its divisors is an integer number (6445801).

Almost surely, 2^12891601 is an apocalyptic number.

It is an amenable number.

12891601 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891601 is an equidigital number, since it uses as much as digits as its factorization.

12891601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 12891601 is about 3590.4875713474. The cubic root of 12891601 is about 234.4780993757.

The spelling of 12891601 in words is "twelve million, eight hundred ninety-one thousand, six hundred one".