1271841997 has 2 divisors, whose sum is σ = 1271841998. Its totient is φ = 1271841996.

The previous prime is 1271841983. The next prime is 1271842001. The reversal of 1271841997 is 7991481721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1077546276 + 194295721 = 32826^2 + 13939^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271841997 - 2⁷ = 1271841869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1271841997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271841947) 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, 635920998 + 635920999.

It is an arithmetic number, because the mean of its divisors is an integer number (635920999).

Almost surely, 2^1271841997 is an apocalyptic number.

It is an amenable number.

1271841997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271841997 is an equidigital number, since it uses as much as digits as its factorization.

1271841997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 49.

The square root of 1271841997 is about 35662.8938393956. The cubic root of 1271841997 is about 1083.4554383761.

The spelling of 1271841997 in words is "one billion, two hundred seventy-one million, eight hundred forty-one thousand, nine hundred ninety-seven".