12011147 has 4 divisors (see below), whose sum is σ = 12290520. Its totient is φ = 11731776.

The previous prime is 12011143. The next prime is 12011149. The reversal of 12011147 is 74111021.

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

It is not a de Polignac number, because 12011147 - 2² = 12011143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011143) 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 in 3 ways as a sum of consecutive naturals, for example, 139622 + ... + 139707.

It is an arithmetic number, because the mean of its divisors is an integer number (3072630).

Almost surely, 2^12011147 is an apocalyptic number.

12011147 is the 1853-rd centered heptagonal number.

12011147 is a deficient number, since it is larger than the sum of its proper divisors (279373).

12011147 is an equidigital number, since it uses as much as digits as its factorization.

12011147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279372.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 12011147 is about 3465.7101725332. The cubic root of 12011147 is about 229.0137161810.

Adding to 12011147 its reverse (74111021), we get a palindrome (86122168).

The spelling of 12011147 in words is "twelve million, eleven thousand, one hundred forty-seven".