127778449 has 2 divisors, whose sum is σ = 127778450. Its totient is φ = 127778448.

The previous prime is 127778429. The next prime is 127778461. The reversal of 127778449 is 944877721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116488849 + 11289600 = 10793^2 + 3360^2 .

It is a cyclic number.

It is not a de Polignac number, because 127778449 - 2¹¹ = 127776401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127778429) 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, 63889224 + 63889225.

It is an arithmetic number, because the mean of its divisors is an integer number (63889225).

Almost surely, 2^127778449 is an apocalyptic number.

It is an amenable number.

127778449 is a deficient number, since it is larger than the sum of its proper divisors (1).

127778449 is an equidigital number, since it uses as much as digits as its factorization.

127778449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 49.

The square root of 127778449 is about 11303.9129950650. The cubic root of 127778449 is about 503.6774845693.

The spelling of 127778449 in words is "one hundred twenty-seven million, seven hundred seventy-eight thousand, four hundred forty-nine".