127656313129 has 4 divisors (see below), whose sum is σ = 127791974340. Its totient is φ = 127520651920.

The previous prime is 127656313117. The next prime is 127656313153. The reversal of 127656313129 is 921313656721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67016265625 + 60640047504 = 258875^2 + 246252^2 .

It is a cyclic number.

It is not a de Polignac number, because 127656313129 - 2⁹ = 127656312617 is a prime.

It is a super-2 number, since 2×127656313129² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127656311129) 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, 67829194 + ... + 67831075.

It is an arithmetic number, because the mean of its divisors is an integer number (31947993585).

Almost surely, 2^127656313129 is an apocalyptic number.

It is an amenable number.

127656313129 is a deficient number, since it is larger than the sum of its proper divisors (135661211).

127656313129 is an equidigital number, since it uses as much as digits as its factorization.

127656313129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135661210.

The product of its digits is 408240, while the sum is 46.

The spelling of 127656313129 in words is "one hundred twenty-seven billion, six hundred fifty-six million, three hundred thirteen thousand, one hundred twenty-nine".