1317047721181 has 8 divisors (see below), whose sum is σ = 1321665410520. Its totient is φ = 1312430866752.

The previous prime is 1317047721167. The next prime is 1317047721193. The reversal of 1317047721181 is 1811277407131.

It can be written as a sum of positive squares in 4 ways, for example, as 671490108025 + 645557613156 = 819445^2 + 803466^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1317047721181 - 2¹⁵ = 1317047688413 is a prime.

It is a super-2 number, since 2×1317047721181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317047721481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3040171 + ... + 3446263.

It is an arithmetic number, because the mean of its divisors is an integer number (165208176315).

Almost surely, 2^{1317047721181} is an apocalyptic number.

It is an amenable number.

1317047721181 is a deficient number, since it is larger than the sum of its proper divisors (4617689339).

1317047721181 is a wasteful number, since it uses less digits than its factorization.

1317047721181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417455.

The product of its (nonzero) digits is 65856, while the sum is 43.

The spelling of 1317047721181 in words is "one trillion, three hundred seventeen billion, forty-seven million, seven hundred twenty-one thousand, one hundred eighty-one".