12890191 has 2 divisors, whose sum is σ = 12890192. Its totient is φ = 12890190.

The previous prime is 12890179. The next prime is 12890209. The reversal of 12890191 is 19109821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12890191 - 2⁵ = 12890159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12890291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445095 + 6445096.

It is an arithmetic number, because the mean of its divisors is an integer number (6445096).

Almost surely, 2^12890191 is an apocalyptic number.

12890191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12890191 is an equidigital number, since it uses as much as digits as its factorization.

12890191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 12890191 is about 3590.2912138154. The cubic root of 12890191 is about 234.4695504977.

The spelling of 12890191 in words is "twelve million, eight hundred ninety thousand, one hundred ninety-one".