127681139 has 2 divisors, whose sum is σ = 127681140. Its totient is φ = 127681138.

The previous prime is 127681129. The next prime is 127681193. The reversal of 127681139 is 931186721.

Together with next prime (127681193) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127681139 - 2¹⁶ = 127615603 is a prime.

It is not a weakly prime, because it can be changed into another prime (127681109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63840569 + 63840570.

It is an arithmetic number, because the mean of its divisors is an integer number (63840570).

Almost surely, 2^127681139 is an apocalyptic number.

127681139 is a deficient number, since it is larger than the sum of its proper divisors (1).

127681139 is an equidigital number, since it uses as much as digits as its factorization.

127681139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 127681139 is about 11299.6079135517. The cubic root of 127681139 is about 503.5495931457.

The spelling of 127681139 in words is "one hundred twenty-seven million, six hundred eighty-one thousand, one hundred thirty-nine".