12911251 has 2 divisors, whose sum is σ = 12911252. Its totient is φ = 12911250.

The previous prime is 12911243. The next prime is 12911263. The reversal of 12911251 is 15211921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12911251 - 2³ = 12911243 is a prime.

It is not a weakly prime, because it can be changed into another prime (12911281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6455625 + 6455626.

It is an arithmetic number, because the mean of its divisors is an integer number (6455626).

Almost surely, 2^12911251 is an apocalyptic number.

12911251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12911251 is an equidigital number, since it uses as much as digits as its factorization.

12911251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 22.

The square root of 12911251 is about 3593.2229265661. Note that the first 3 decimals coincide. The cubic root of 12911251 is about 234.5971731728.

The spelling of 12911251 in words is "twelve million, nine hundred eleven thousand, two hundred fifty-one".