1272289 has 2 divisors, whose sum is σ = 1272290. Its totient is φ = 1272288.

The previous prime is 1272287. The next prime is 1272329. The reversal of 1272289 is 9822721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1030225 + 242064 = 1015^2 + 492^2 .

It is an emirp because it is prime and its reverse (9822721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1272289 - 2¹ = 1272287 is a prime.

Together with 1272287, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1272289.

It is not a weakly prime, because it can be changed into another prime (1272281) 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 as a sum of consecutive naturals, namely, 636144 + 636145.

It is an arithmetic number, because the mean of its divisors is an integer number (636145).

2^1272289 is an apocalyptic number.

It is an amenable number.

1272289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272289 is an equidigital number, since it uses as much as digits as its factorization.

1272289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 1272289 is about 1127.9578892849. The cubic root of 1272289 is about 108.3582354326.

It can be divided in two parts, 127 and 2289, that multiplied together give a triangular number (290703 = T₇₆₂).

The spelling of 1272289 in words is "one million, two hundred seventy-two thousand, two hundred eighty-nine".