1271609 has 2 divisors, whose sum is σ = 1271610. Its totient is φ = 1271608.

The previous prime is 1271603. The next prime is 1271657. The reversal of 1271609 is 9061721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 760384 + 511225 = 872^2 + 715^2 .

It is an emirp because it is prime and its reverse (9061721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1271609 - 2⁸ = 1271353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1271603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635804 + 635805.

It is an arithmetic number, because the mean of its divisors is an integer number (635805).

2^1271609 is an apocalyptic number.

It is an amenable number.

1271609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271609 is an equidigital number, since it uses as much as digits as its factorization.

1271609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 1271609 is about 1127.6564193051. The cubic root of 1271609 is about 108.3389272588.

The spelling of 1271609 in words is "one million, two hundred seventy-one thousand, six hundred nine".