127778461 has 2 divisors, whose sum is σ = 127778462. Its totient is φ = 127778460.

The previous prime is 127778449. The next prime is 127778467. The reversal of 127778461 is 164877721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101707225 + 26071236 = 10085^2 + 5106^2 .

It is a cyclic number.

It is not a de Polignac number, because 127778461 - 2⁵ = 127778429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127778467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63889230 + 63889231.

It is an arithmetic number, because the mean of its divisors is an integer number (63889231).

Almost surely, 2^127778461 is an apocalyptic number.

It is an amenable number.

127778461 is a deficient number, since it is larger than the sum of its proper divisors (1).

127778461 is an equidigital number, since it uses as much as digits as its factorization.

127778461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 43.

The square root of 127778461 is about 11303.9135258547. The cubic root of 127778461 is about 503.6775003365.

The spelling of 127778461 in words is "one hundred twenty-seven million, seven hundred seventy-eight thousand, four hundred sixty-one".