12231291 has 4 divisors (see below), whose sum is σ = 16308392. Its totient is φ = 8154192.

The previous prime is 12231283. The next prime is 12231311. The reversal of 12231291 is 19213221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19213221 = 3 ⋅6404407.

It is not a de Polignac number, because 12231291 - 2³ = 12231283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12231691) 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, 2038546 + ... + 2038551.

It is an arithmetic number, because the mean of its divisors is an integer number (4077098).

Almost surely, 2^12231291 is an apocalyptic number.

12231291 is a deficient number, since it is larger than the sum of its proper divisors (4077101).

12231291 is an equidigital number, since it uses as much as digits as its factorization.

12231291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077100.

The product of its digits is 216, while the sum is 21.

The square root of 12231291 is about 3497.3262644483. The cubic root of 12231291 is about 230.4043988177.

It can be divided in two parts, 122 and 31291, that added together give a palindrome (31413).

The spelling of 12231291 in words is "twelve million, two hundred thirty-one thousand, two hundred ninety-one".