127266721 has 2 divisors, whose sum is σ = 127266722. Its totient is φ = 127266720.

The previous prime is 127266677. The next prime is 127266757. The reversal of 127266721 is 127662721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84180625 + 43086096 = 9175^2 + 6564^2 .

It is a cyclic number.

It is not a de Polignac number, because 127266721 - 2¹³ = 127258529 is a prime.

It is not a weakly prime, because it can be changed into another prime (127266781) 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, 63633360 + 63633361.

It is an arithmetic number, because the mean of its divisors is an integer number (63633361).

Almost surely, 2^127266721 is an apocalyptic number.

It is an amenable number.

127266721 is a deficient number, since it is larger than the sum of its proper divisors (1).

127266721 is an equidigital number, since it uses as much as digits as its factorization.

127266721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 127266721 is about 11281.2552936276. The cubic root of 127266721 is about 503.0042079837.

The spelling of 127266721 in words is "one hundred twenty-seven million, two hundred sixty-six thousand, seven hundred twenty-one".