12891251 has 2 divisors, whose sum is σ = 12891252. Its totient is φ = 12891250.

The previous prime is 12891233. The next prime is 12891259. The reversal of 12891251 is 15219821.

12891251 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 is an emirp because it is prime and its reverse (15219821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12891251 - 2⁶ = 12891187 is a prime.

It is not a weakly prime, because it can be changed into another prime (12891259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445625 + 6445626.

It is an arithmetic number, because the mean of its divisors is an integer number (6445626).

Almost surely, 2^12891251 is an apocalyptic number.

12891251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891251 is an equidigital number, since it uses as much as digits as its factorization.

12891251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 29.

The square root of 12891251 is about 3590.4388311180. The cubic root of 12891251 is about 234.4759773719.

The spelling of 12891251 in words is "twelve million, eight hundred ninety-one thousand, two hundred fifty-one".