12272991 has 4 divisors (see below), whose sum is σ = 16363992. Its totient is φ = 8181992.

The previous prime is 12272987. The next prime is 12273013. The reversal of 12272991 is 19927221.

12272991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 12272991 - 2² = 12272987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12272951) 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, 2045496 + ... + 2045501.

It is an arithmetic number, because the mean of its divisors is an integer number (4090998).

Almost surely, 2^12272991 is an apocalyptic number.

12272991 is a deficient number, since it is larger than the sum of its proper divisors (4091001).

12272991 is an equidigital number, since it uses as much as digits as its factorization.

12272991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091000.

The product of its digits is 4536, while the sum is 33.

The square root of 12272991 is about 3503.2828889486. The cubic root of 12272991 is about 230.6659401765.

The spelling of 12272991 in words is "twelve million, two hundred seventy-two thousand, nine hundred ninety-one".