1271957395939 has 2 divisors, whose sum is σ = 1271957395940. Its totient is φ = 1271957395938.

The previous prime is 1271957395937. The next prime is 1271957395991. The reversal of 1271957395939 is 9395937591721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1271957395939 - 2¹ = 1271957395937 is a prime.

Together with 1271957395937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1271957395931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635978697969 + 635978697970.

It is an arithmetic number, because the mean of its divisors is an integer number (635978697970).

Almost surely, 2^{1271957395939} is an apocalyptic number.

1271957395939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271957395939 is an equidigital number, since it uses as much as digits as its factorization.

1271957395939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144670050, while the sum is 70.

The spelling of 1271957395939 in words is "one trillion, two hundred seventy-one billion, nine hundred fifty-seven million, three hundred ninety-five thousand, nine hundred thirty-nine".