1317805273549 has 2 divisors, whose sum is σ = 1317805273550. Its totient is φ = 1317805273548.

The previous prime is 1317805273489. The next prime is 1317805273583. The reversal of 1317805273549 is 9453725087131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1279120284324 + 38684989225 = 1130982^2 + 196685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317805273549 - 2¹⁵ = 1317805240781 is a prime.

It is a super-2 number, since 2×1317805273549² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1317805273549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317805273949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658902636774 + 658902636775.

It is an arithmetic number, because the mean of its divisors is an integer number (658902636775).

Almost surely, 2^{1317805273549} is an apocalyptic number.

It is an amenable number.

1317805273549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317805273549 is an equidigital number, since it uses as much as digits as its factorization.

1317805273549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 1317805273549 in words is "one trillion, three hundred seventeen billion, eight hundred five million, two hundred seventy-three thousand, five hundred forty-nine".