1271640347 has 2 divisors, whose sum is σ = 1271640348. Its totient is φ = 1271640346.

The previous prime is 1271640313. The next prime is 1271640361. The reversal of 1271640347 is 7430461721.

It is a strong prime.

It is an emirp because it is prime and its reverse (7430461721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1271640347 - 2⁸ = 1271640091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1271640397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635820173 + 635820174.

It is an arithmetic number, because the mean of its divisors is an integer number (635820174).

Almost surely, 2^1271640347 is an apocalyptic number.

1271640347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271640347 is an equidigital number, since it uses as much as digits as its factorization.

1271640347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 1271640347 is about 35660.0665591078. The cubic root of 1271640347 is about 1083.3981748855.

The spelling of 1271640347 in words is "one billion, two hundred seventy-one million, six hundred forty thousand, three hundred forty-seven".