1271303161 has 2 divisors, whose sum is σ = 1271303162. Its totient is φ = 1271303160.

The previous prime is 1271303123. The next prime is 1271303171. The reversal of 1271303161 is 1613031721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1257127936 + 14175225 = 35456^2 + 3765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271303161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1271303101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635651580 + 635651581.

It is an arithmetic number, because the mean of its divisors is an integer number (635651581).

Almost surely, 2^1271303161 is an apocalyptic number.

It is an amenable number.

1271303161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271303161 is an equidigital number, since it uses as much as digits as its factorization.

1271303161 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 25.

The square root of 1271303161 is about 35655.3384642468. The cubic root of 1271303161 is about 1083.3024090791.

Adding to 1271303161 its reverse (1613031721), we get a palindrome (2884334882).

The spelling of 1271303161 in words is "one billion, two hundred seventy-one million, three hundred three thousand, one hundred sixty-one".