12256191 has 24 divisors (see below), whose sum is σ = 18962944. Its totient is φ = 7902360.

The previous prime is 12256187. The next prime is 12256207. The reversal of 12256191 is 19165221.

12256191 is a `hidden beast` number, since 12 + 2 + 561 + 91 = 666.

It is not a de Polignac number, because 12256191 - 2² = 12256187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12256151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6720 + ... + 8346.

Almost surely, 2^12256191 is an apocalyptic number.

12256191 is a deficient number, since it is larger than the sum of its proper divisors (6706753).

12256191 is an equidigital number, since it uses as much as digits as its factorization.

12256191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1661 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 12256191 is about 3500.8843168548. The cubic root of 12256191 is about 230.5606423634.

The spelling of 12256191 in words is "twelve million, two hundred fifty-six thousand, one hundred ninety-one".