1317805273849 has 9 divisors (see below), whose sum is σ = 1320797883013. Its totient is φ = 1314819437692.

The previous prime is 1317805273831. The next prime is 1317805273891. The reversal of 1317805273849 is 9483725087131.

The square root of 1317805273849 is 1147957.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1317805273849 - 2²³ = 1317796885241 is a prime.

It is a super-2 number, since 2×1317805273849² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1317805273793 and 1317805273802.

It is not an unprimeable number, because it can be changed into a prime (1317805273549) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 646298772 + ... + 646300810.

Almost surely, 2^{1317805273849} is an apocalyptic number.

1317805273849 is the 1147957-th square number.

1317805273849 is the 573979-th centered octagonal number.

It is an amenable number.

1317805273849 is a deficient number, since it is larger than the sum of its proper divisors (2992609164).

1317805273849 is an frugal number, since it uses more digits than its factorization.

1317805273849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204 (or 2602 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 1317805273849 in words is "one trillion, three hundred seventeen billion, eight hundred five million, two hundred seventy-three thousand, eight hundred forty-nine".