1272917 has 2 divisors, whose sum is σ = 1272918. Its totient is φ = 1272916.

The previous prime is 1272913. The next prime is 1272919. The reversal of 1272917 is 7192721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267876 + 5041 = 1126^2 + 71^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272917 - 2² = 1272913 is a prime.

Together with 1272919, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1272917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272913) 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, 636458 + 636459.

It is an arithmetic number, because the mean of its divisors is an integer number (636459).

2^1272917 is an apocalyptic number.

It is an amenable number.

1272917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272917 is an equidigital number, since it uses as much as digits as its factorization.

1272917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 29.

The square root of 1272917 is about 1128.2362341283. The cubic root of 1272917 is about 108.3760609891.

The spelling of 1272917 in words is "one million, two hundred seventy-two thousand, nine hundred seventeen".