127981349 has 2 divisors, whose sum is σ = 127981350. Its totient is φ = 127981348.

The previous prime is 127981339. The next prime is 127981351. The reversal of 127981349 is 943189721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99700225 + 28281124 = 9985^2 + 5318^2 .

It is an emirp because it is prime and its reverse (943189721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127981349 is a prime.

Together with 127981351, 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 (127981319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63990674 + 63990675.

It is an arithmetic number, because the mean of its divisors is an integer number (63990675).

Almost surely, 2^127981349 is an apocalyptic number.

It is an amenable number.

127981349 is a deficient number, since it is larger than the sum of its proper divisors (1).

127981349 is an equidigital number, since it uses as much as digits as its factorization.

127981349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 127981349 is about 11312.8842034205. The cubic root of 127981349 is about 503.9439408653.

It can be divided in two parts, 1279 and 81349, that added together give a palindrome (82628).

The spelling of 127981349 in words is "one hundred twenty-seven million, nine hundred eighty-one thousand, three hundred forty-nine".