1271117971 has 2 divisors, whose sum is σ = 1271117972. Its totient is φ = 1271117970.

The previous prime is 1271117963. The next prime is 1271118047. The reversal of 1271117971 is 1797111721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1271117971 - 2³ = 1271117963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1271117971.

It is not a weakly prime, because it can be changed into another prime (1271112971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635558985 + 635558986.

It is an arithmetic number, because the mean of its divisors is an integer number (635558986).

Almost surely, 2^1271117971 is an apocalyptic number.

1271117971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271117971 is an equidigital number, since it uses as much as digits as its factorization.

1271117971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6174, while the sum is 37.

The square root of 1271117971 is about 35652.7414233464. The cubic root of 1271117971 is about 1083.2498051786.

The spelling of 1271117971 in words is "one billion, two hundred seventy-one million, one hundred seventeen thousand, nine hundred seventy-one".