127891349161 has 3 divisors (see below), whose sum is σ = 127891706781. Its totient is φ = 127890991542.

The previous prime is 127891349153. The next prime is 127891349177. The reversal of 127891349161 is 161943198721.

The square root of 127891349161 is 357619.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 127891349161 - 2³ = 127891349153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 127891349099 and 127891349108.

It is not an unprimeable number, because it can be changed into a prime (127891349101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 178810 + ... + 536428.

It is an arithmetic number, because the mean of its divisors is an integer number (42630568927).

Almost surely, 2^127891349161 is an apocalyptic number.

127891349161 is the 357619-th square number.

127891349161 is the 178810-th centered octagonal number.

It is an amenable number.

127891349161 is a deficient number, since it is larger than the sum of its proper divisors (357620).

127891349161 is an frugal number, since it uses more digits than its factorization.

127891349161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715238 (or 357619 counting only the distinct ones).

The product of its digits is 653184, while the sum is 52.

The spelling of 127891349161 in words is "one hundred twenty-seven billion, eight hundred ninety-one million, three hundred forty-nine thousand, one hundred sixty-one".