127055821 has 2 divisors, whose sum is σ = 127055822. Its totient is φ = 127055820.

The previous prime is 127055813. The next prime is 127055827. The reversal of 127055821 is 128550721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119137225 + 7918596 = 10915^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 127055821 - 2³ = 127055813 is a prime.

It is a super-2 number, since 2×127055821² = 32286363299968082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127055827) 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, 63527910 + 63527911.

It is an arithmetic number, because the mean of its divisors is an integer number (63527911).

Almost surely, 2^127055821 is an apocalyptic number.

It is an amenable number.

127055821 is a deficient number, since it is larger than the sum of its proper divisors (1).

127055821 is an equidigital number, since it uses as much as digits as its factorization.

127055821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 127055821 is about 11271.9040538855. The cubic root of 127055821 is about 502.7262032825.

The spelling of 127055821 in words is "one hundred twenty-seven million, fifty-five thousand, eight hundred twenty-one".