127993381 has 2 divisors, whose sum is σ = 127993382. Its totient is φ = 127993380.

The previous prime is 127993339. The next prime is 127993399. The reversal of 127993381 is 183399721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90060100 + 37933281 = 9490^2 + 6159^2 .

It is an emirp because it is prime and its reverse (183399721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127993381 - 2¹¹ = 127991333 is a prime.

It is a super-4 number, since 4×127993381⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127993331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63996690 + 63996691.

It is an arithmetic number, because the mean of its divisors is an integer number (63996691).

Almost surely, 2^127993381 is an apocalyptic number.

It is an amenable number.

127993381 is a deficient number, since it is larger than the sum of its proper divisors (1).

127993381 is an equidigital number, since it uses as much as digits as its factorization.

127993381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 127993381 is about 11313.4159739665. The cubic root of 127993381 is about 503.9597329151.

The spelling of 127993381 in words is "one hundred twenty-seven million, nine hundred ninety-three thousand, three hundred eighty-one".