12071191 has 4 divisors (see below), whose sum is σ = 13168584. Its totient is φ = 10973800.

The previous prime is 12071167. The next prime is 12071197. The reversal of 12071191 is 19117021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12071191 - 2⁷ = 12071063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12071197) 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 in 3 ways as a sum of consecutive naturals, for example, 548680 + ... + 548701.

It is an arithmetic number, because the mean of its divisors is an integer number (3292146).

Almost surely, 2^12071191 is an apocalyptic number.

12071191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12071191 is a deficient number, since it is larger than the sum of its proper divisors (1097393).

12071191 is a wasteful number, since it uses less digits than its factorization.

12071191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097392.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 12071191 is about 3474.3619558129. The cubic root of 12071191 is about 229.3946969847.

The spelling of 12071191 in words is "twelve million, seventy-one thousand, one hundred ninety-one".