1277042273909 has 2 divisors, whose sum is σ = 1277042273910. Its totient is φ = 1277042273908.

The previous prime is 1277042273863. The next prime is 1277042273929. The reversal of 1277042273909 is 9093722407721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276497751684 + 544522225 = 1129822^2 + 23335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277042273909 - 2¹² = 1277042269813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1277042273929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638521136954 + 638521136955.

It is an arithmetic number, because the mean of its divisors is an integer number (638521136955).

Almost surely, 2^{1277042273909} is an apocalyptic number.

It is an amenable number.

1277042273909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277042273909 is an equidigital number, since it uses as much as digits as its factorization.

1277042273909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 53.

The spelling of 1277042273909 in words is "one trillion, two hundred seventy-seven billion, forty-two million, two hundred seventy-three thousand, nine hundred nine".