1277938523401 has 2 divisors, whose sum is σ = 1277938523402. Its totient is φ = 1277938523400.

The previous prime is 1277938523353. The next prime is 1277938523461. The reversal of 1277938523401 is 1043258397721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 871564147776 + 406374375625 = 933576^2 + 637475^2 .

It is an emirp because it is prime and its reverse (1043258397721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1277938523401 - 2⁷ = 1277938523273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1277938523461) 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, 638969261700 + 638969261701.

It is an arithmetic number, because the mean of its divisors is an integer number (638969261701).

Almost surely, 2^{1277938523401} is an apocalyptic number.

It is an amenable number.

1277938523401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277938523401 is an equidigital number, since it uses as much as digits as its factorization.

1277938523401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 1277938523401 in words is "one trillion, two hundred seventy-seven billion, nine hundred thirty-eight million, five hundred twenty-three thousand, four hundred one".