1317805273949 has 2 divisors, whose sum is σ = 1317805273950. Its totient is φ = 1317805273948.

The previous prime is 1317805273921. The next prime is 1317805273973. The reversal of 1317805273949 is 9493725087131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1317805273849 + 100 = 1147957^2 + 10^2 .

It is an emirp because it is prime and its reverse (9493725087131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1317805273949 - 2¹² = 1317805269853 is a prime.

It is a super-2 number, since 2×1317805273949² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317805273999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658902636974 + 658902636975.

It is an arithmetic number, because the mean of its divisors is an integer number (658902636975).

Almost surely, 2^{1317805273949} is an apocalyptic number.

It is an amenable number.

1317805273949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317805273949 is an equidigital number, since it uses as much as digits as its factorization.

1317805273949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 1317805273949 in words is "one trillion, three hundred seventeen billion, eight hundred five million, two hundred seventy-three thousand, nine hundred forty-nine".