127101865981 has 2 divisors, whose sum is σ = 127101865982. Its totient is φ = 127101865980.

The previous prime is 127101865973. The next prime is 127101865993. The reversal of 127101865981 is 189568101721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74229002500 + 52872863481 = 272450^2 + 229941^2 .

It is a cyclic number.

It is not a de Polignac number, because 127101865981 - 2³ = 127101865973 is a prime.

It is a super-2 number, since 2×127101865981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127101865931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63550932990 + 63550932991.

It is an arithmetic number, because the mean of its divisors is an integer number (63550932991).

Almost surely, 2^127101865981 is an apocalyptic number.

It is an amenable number.

127101865981 is a deficient number, since it is larger than the sum of its proper divisors (1).

127101865981 is an equidigital number, since it uses as much as digits as its factorization.

127101865981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 49.

The spelling of 127101865981 in words is "one hundred twenty-seven billion, one hundred one million, eight hundred sixty-five thousand, nine hundred eighty-one".