1271715110509 has 2 divisors, whose sum is σ = 1271715110510. Its totient is φ = 1271715110508.

The previous prime is 1271715110461. The next prime is 1271715110513. The reversal of 1271715110509 is 9050115171721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1096386997225 + 175328113284 = 1047085^2 + 418722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271715110509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271715110569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635857555254 + 635857555255.

It is an arithmetic number, because the mean of its divisors is an integer number (635857555255).

Almost surely, 2^{1271715110509} is an apocalyptic number.

It is an amenable number.

1271715110509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271715110509 is an equidigital number, since it uses as much as digits as its factorization.

1271715110509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 40.

The spelling of 1271715110509 in words is "one trillion, two hundred seventy-one billion, seven hundred fifteen million, one hundred ten thousand, five hundred nine".