127981 has 8 divisors (see below), whose sum is σ = 149760. Its totient is φ = 107088.

The previous prime is 127979. The next prime is 127997. The reversal of 127981 is 189721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 127981 - 2¹ = 127979 is a prime.

It is a super-2 number, since 2×127981² = 32758272722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127921) 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 7 ways as a sum of consecutive naturals, for example, 135 + ... + 523.

It is an arithmetic number, because the mean of its divisors is an integer number (18720).

2¹²⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

127981 is a deficient number, since it is larger than the sum of its proper divisors (21779).

127981 is an equidigital number, since it uses as much as digits as its factorization.

127981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its digits is 1008, while the sum is 28.

The square root of 127981 is about 357.7443221073. The cubic root of 127981 is about 50.3943482787.

The spelling of 127981 in words is "one hundred twenty-seven thousand, nine hundred eighty-one".