127765321 has 2 divisors, whose sum is σ = 127765322. Its totient is φ = 127765320.

The previous prime is 127765289. The next prime is 127765333. The reversal of 127765321 is 123567721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103124025 + 24641296 = 10155^2 + 4964^2 .

It is an emirp because it is prime and its reverse (123567721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127765321 - 2⁵ = 127765289 is a prime.

It is not a weakly prime, because it can be changed into another prime (127765381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63882660 + 63882661.

It is an arithmetic number, because the mean of its divisors is an integer number (63882661).

Almost surely, 2^127765321 is an apocalyptic number.

It is an amenable number.

127765321 is a deficient number, since it is larger than the sum of its proper divisors (1).

127765321 is an equidigital number, since it uses as much as digits as its factorization.

127765321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 34.

The square root of 127765321 is about 11303.3322962744. The cubic root of 127765321 is about 503.6602346482.

The spelling of 127765321 in words is "one hundred twenty-seven million, seven hundred sixty-five thousand, three hundred twenty-one".