12747121 has 2 divisors, whose sum is σ = 12747122. Its totient is φ = 12747120.

The previous prime is 12747047. The next prime is 12747131. The reversal of 12747121 is 12174721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 5239521 = 2740^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 12747121 - 2¹⁵ = 12714353 is a prime.

It is not a weakly prime, because it can be changed into another prime (12747131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6373560 + 6373561.

It is an arithmetic number, because the mean of its divisors is an integer number (6373561).

Almost surely, 2^12747121 is an apocalyptic number.

It is an amenable number.

12747121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12747121 is an equidigital number, since it uses as much as digits as its factorization.

12747121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 25.

The square root of 12747121 is about 3570.3110508750. The cubic root of 12747121 is about 233.5988512583.

The spelling of 12747121 in words is "twelve million, seven hundred forty-seven thousand, one hundred twenty-one".