12956191 has 2 divisors, whose sum is σ = 12956192. Its totient is φ = 12956190.

The previous prime is 12956183. The next prime is 12956249. The reversal of 12956191 is 19165921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12956191 - 2³ = 12956183 is a prime.

It is equal to p₈₄₆₅₉₂ and since 12956191 and 846592 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12956101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6478095 + 6478096.

It is an arithmetic number, because the mean of its divisors is an integer number (6478096).

Almost surely, 2^12956191 is an apocalyptic number.

12956191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12956191 is an equidigital number, since it uses as much as digits as its factorization.

12956191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 34.

The square root of 12956191 is about 3599.4709333456. The cubic root of 12956191 is about 234.8690442850.

The spelling of 12956191 in words is "twelve million, nine hundred fifty-six thousand, one hundred ninety-one".