1271247113 has 2 divisors, whose sum is σ = 1271247114. Its totient is φ = 1271247112.

The previous prime is 1271247071. The next prime is 1271247121. The reversal of 1271247113 is 3117421721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 899220169 + 372026944 = 29987^2 + 19288^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271247113 - 2⁶ = 1271247049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1271247143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635623556 + 635623557.

It is an arithmetic number, because the mean of its divisors is an integer number (635623557).

Almost surely, 2^1271247113 is an apocalyptic number.

It is an amenable number.

1271247113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271247113 is an equidigital number, since it uses as much as digits as its factorization.

1271247113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 29.

The square root of 1271247113 is about 35654.5524863235. The cubic root of 1271247113 is about 1083.2864889777.

Adding to 1271247113 its reverse (3117421721), we get a palindrome (4388668834).

The spelling of 1271247113 in words is "one billion, two hundred seventy-one million, two hundred forty-seven thousand, one hundred thirteen".