127988669 has 2 divisors, whose sum is σ = 127988670. Its totient is φ = 127988668.

The previous prime is 127988639. The next prime is 127988671. The reversal of 127988669 is 966889721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106708900 + 21279769 = 10330^2 + 4613^2 .

It is a cyclic number.

It is not a de Polignac number, because 127988669 - 2¹² = 127984573 is a prime.

It is a super-2 number, since 2×127988669² = 32762198784783122, which contains 22 as substring.

Together with 127988671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127988639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63994334 + 63994335.

It is an arithmetic number, because the mean of its divisors is an integer number (63994335).

Almost surely, 2^127988669 is an apocalyptic number.

It is an amenable number.

127988669 is a deficient number, since it is larger than the sum of its proper divisors (1).

127988669 is an equidigital number, since it uses as much as digits as its factorization.

127988669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 56.

The square root of 127988669 is about 11313.2077237183. The cubic root of 127988669 is about 503.9535485135.

The spelling of 127988669 in words is "one hundred twenty-seven million, nine hundred eighty-eight thousand, six hundred sixty-nine".