1277042273929 has 2 divisors, whose sum is σ = 1277042273930. Its totient is φ = 1277042273928.

The previous prime is 1277042273909. The next prime is 1277042273951. The reversal of 1277042273929 is 9293722407721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694030617225 + 583011656704 = 833085^2 + 763552^2 .

It is an emirp because it is prime and its reverse (9293722407721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1277042273929 - 2⁹ = 1277042273417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1277042273929.

It is not a weakly prime, because it can be changed into another prime (1277042273909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638521136964 + 638521136965.

It is an arithmetic number, because the mean of its divisors is an integer number (638521136965).

Almost surely, 2^{1277042273929} is an apocalyptic number.

It is an amenable number.

1277042273929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277042273929 is an equidigital number, since it uses as much as digits as its factorization.

1277042273929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 1277042273929 in words is "one trillion, two hundred seventy-seven billion, forty-two million, two hundred seventy-three thousand, nine hundred twenty-nine".