127820161 has 16 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 99786240.

The previous prime is 127820159. The next prime is 127820191. The reversal of 127820161 is 161028721.

It is a cyclic number.

It is not a de Polignac number, because 127820161 - 2¹ = 127820159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127820111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13636 + ... + 21013.

It is an arithmetic number, because the mean of its divisors is an integer number (9979200).

Almost surely, 2^127820161 is an apocalyptic number.

It is an amenable number.

127820161 is a deficient number, since it is larger than the sum of its proper divisors (31847039).

127820161 is a wasteful number, since it uses less digits than its factorization.

127820161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34704.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 127820161 is about 11305.7578693337. The cubic root of 127820161 is about 503.7322854367.

Adding to 127820161 its reverse (161028721), we get a palindrome (288848882).

The spelling of 127820161 in words is "one hundred twenty-seven million, eight hundred twenty thousand, one hundred sixty-one".