1272001 has 2 divisors, whose sum is σ = 1272002. Its totient is φ = 1272000.

The previous prime is 1271999. The next prime is 1272043. The reversal of 1272001 is 1002721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 62001 = 1100^2 + 249^2 .

It is an emirp because it is prime and its reverse (1002721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1272001 - 2¹ = 1271999 is a prime.

Together with 1271999, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1272071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636000 + 636001.

It is an arithmetic number, because the mean of its divisors is an integer number (636001).

2^1272001 is an apocalyptic number.

It is an amenable number.

1272001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272001 is an equidigital number, since it uses as much as digits as its factorization.

1272001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 1272001 is about 1127.8302177190. The cubic root of 1272001 is about 108.3500586931.

Adding to 1272001 its reverse (1002721), we get a palindrome (2274722).

The spelling of 1272001 in words is "one million, two hundred seventy-two thousand, one".