127791 has 8 divisors (see below), whose sum is σ = 189360. Its totient is φ = 85176.

The previous prime is 127781. The next prime is 127807. The reversal of 127791 is 197721.

It is not a de Polignac number, because 127791 - 2⁶ = 127727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4733 = 127791 / (1 + 2 + 7 + 7 + 9 + 1).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2340 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (23670).

2¹²⁷⁷⁹¹ is an apocalyptic number.

127791 is a deficient number, since it is larger than the sum of its proper divisors (61569).

127791 is an equidigital number, since it uses as much as digits as its factorization.

127791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742 (or 4736 counting only the distinct ones).

The product of its digits is 882, while the sum is 27.

The square root of 127791 is about 357.4786706924. The cubic root of 127791 is about 50.3693975220.

The spelling of 127791 in words is "one hundred twenty-seven thousand, seven hundred ninety-one".