1271321 has 2 divisors, whose sum is σ = 1271322. Its totient is φ = 1271320.

The previous prime is 1271317. The next prime is 1271339. The reversal of 1271321 is 1231721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073296 + 198025 = 1036^2 + 445^2 .

It is an emirp because it is prime and its reverse (1231721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1271321 - 2² = 1271317 is a prime.

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 1271321.

It is not a weakly prime, because it can be changed into another prime (1271351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635660 + 635661.

It is an arithmetic number, because the mean of its divisors is an integer number (635661).

2^1271321 is an apocalyptic number.

It is an amenable number.

1271321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271321 is an equidigital number, since it uses as much as digits as its factorization.

1271321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84, while the sum is 17.

The square root of 1271321 is about 1127.5287136033. The cubic root of 1271321 is about 108.3307476043.

The spelling of 1271321 in words is "one million, two hundred seventy-one thousand, three hundred twenty-one".