127681613 has 2 divisors, whose sum is σ = 127681614. Its totient is φ = 127681612.

The previous prime is 127681597. The next prime is 127681627. The reversal of 127681613 is 316186721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122722084 + 4959529 = 11078^2 + 2227^2 .

It is a cyclic number.

It is not a de Polignac number, because 127681613 - 2⁴ = 127681597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127681313) 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 as a sum of consecutive naturals, namely, 63840806 + 63840807.

It is an arithmetic number, because the mean of its divisors is an integer number (63840807).

Almost surely, 2^127681613 is an apocalyptic number.

It is an amenable number.

127681613 is a deficient number, since it is larger than the sum of its proper divisors (1).

127681613 is an equidigital number, since it uses as much as digits as its factorization.

127681613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 127681613 is about 11299.6288877113. The cubic root of 127681613 is about 503.5502162662.

The spelling of 127681613 in words is "one hundred twenty-seven million, six hundred eighty-one thousand, six hundred thirteen".