12270191 has 4 divisors (see below), whose sum is σ = 12278112. Its totient is φ = 12262272.

The previous prime is 12270173. The next prime is 12270197. The reversal of 12270191 is 19107221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12270191 - 2¹⁰ = 12269167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12270197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (3069528).

Almost surely, 2^12270191 is an apocalyptic number.

12270191 is a deficient number, since it is larger than the sum of its proper divisors (7921).

12270191 is an equidigital number, since it uses as much as digits as its factorization.

12270191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7920.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 12270191 is about 3502.8832409888. The cubic root of 12270191 is about 230.6483972169.

The spelling of 12270191 in words is "twelve million, two hundred seventy thousand, one hundred ninety-one".