127664081 has 2 divisors, whose sum is σ = 127664082. Its totient is φ = 127664080.

The previous prime is 127664063. The next prime is 127664113. The reversal of 127664081 is 180466721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 4343056 = 11105^2 + 2084^2 .

It is an emirp because it is prime and its reverse (180466721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127664081 - 2¹⁴ = 127647697 is a prime.

It is a super-2 number, since 2×127664081² = 32596235155149122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127664041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63832040 + 63832041.

It is an arithmetic number, because the mean of its divisors is an integer number (63832041).

Almost surely, 2^127664081 is an apocalyptic number.

It is an amenable number.

127664081 is a deficient number, since it is larger than the sum of its proper divisors (1).

127664081 is an equidigital number, since it uses as much as digits as its factorization.

127664081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 127664081 is about 11298.8530833886. The cubic root of 127664081 is about 503.5271676682.

It can be divided in two parts, 1276640 and 81, that added together give a palindrome (1276721).

The spelling of 127664081 in words is "one hundred twenty-seven million, six hundred sixty-four thousand, eighty-one".