127971581129 has 6 divisors (see below), whose sum is σ = 148864900554. Its totient is φ = 109689926640.

The previous prime is 127971581119. The next prime is 127971581141. The reversal of 127971581129 is 921185179721.

It can be written as a sum of positive squares in only one way, i.e., 93467775625 + 34503805504 = 305725^2 + 185752^2 .

It is not a de Polignac number, because 127971581129 - 2¹² = 127971577033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127971581119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1305832412 + ... + 1305832509.

It is an arithmetic number, because the mean of its divisors is an integer number (24810816759).

Almost surely, 2^127971581129 is an apocalyptic number.

It is an amenable number.

127971581129 is a deficient number, since it is larger than the sum of its proper divisors (20893319425).

127971581129 is an equidigital number, since it uses as much as digits as its factorization.

127971581129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611664935 (or 2611664928 counting only the distinct ones).

The product of its digits is 635040, while the sum is 53.

The spelling of 127971581129 in words is "one hundred twenty-seven billion, nine hundred seventy-one million, five hundred eighty-one thousand, one hundred twenty-nine".