1277055511321 has 2 divisors, whose sum is σ = 1277055511322. Its totient is φ = 1277055511320.

The previous prime is 1277055511301. The next prime is 1277055511339. The reversal of 1277055511321 is 1231155507721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1223377572096 + 53677939225 = 1106064^2 + 231685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277055511321 - 2²⁹ = 1276518640409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1277055511301) 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, 638527755660 + 638527755661.

It is an arithmetic number, because the mean of its divisors is an integer number (638527755661).

Almost surely, 2^{1277055511321} is an apocalyptic number.

It is an amenable number.

1277055511321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277055511321 is an equidigital number, since it uses as much as digits as its factorization.

1277055511321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73500, while the sum is 40.

The spelling of 1277055511321 in words is "one trillion, two hundred seventy-seven billion, fifty-five million, five hundred eleven thousand, three hundred twenty-one".