127731117 has 4 divisors (see below), whose sum is σ = 170308160. Its totient is φ = 85154076.

The previous prime is 127731089. The next prime is 127731137. The reversal of 127731117 is 711137721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 127731117 - 2⁷ = 127730989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127731137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21288517 + ... + 21288522.

It is an arithmetic number, because the mean of its divisors is an integer number (42577040).

Almost surely, 2^127731117 is an apocalyptic number.

It is an amenable number.

127731117 is a deficient number, since it is larger than the sum of its proper divisors (42577043).

127731117 is an equidigital number, since it uses as much as digits as its factorization.

127731117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42577042.

The product of its digits is 2058, while the sum is 30.

The square root of 127731117 is about 11301.8191898473. The cubic root of 127731117 is about 503.6152857475.

Adding to 127731117 its reverse (711137721), we get a palindrome (838868838).

The spelling of 127731117 in words is "one hundred twenty-seven million, seven hundred thirty-one thousand, one hundred seventeen".