1317332581 has 2 divisors, whose sum is σ = 1317332582. Its totient is φ = 1317332580.

The previous prime is 1317332503. The next prime is 1317332609. The reversal of 1317332581 is 1852337131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1015441956 + 301890625 = 31866^2 + 17375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317332581 - 2⁹ = 1317332069 is a prime.

It is a super-2 number, since 2×1317332581² = 3470730257928243122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317332381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658666290 + 658666291.

It is an arithmetic number, because the mean of its divisors is an integer number (658666291).

Almost surely, 2^1317332581 is an apocalyptic number.

It is an amenable number.

1317332581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317332581 is an equidigital number, since it uses as much as digits as its factorization.

1317332581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 1317332581 is about 36295.0765393875. The cubic root of 1317332581 is about 1096.2219093196.

It can be divided in two parts, 13173 and 32581, that added together give a palindrome (45754).

The spelling of 1317332581 in words is "one billion, three hundred seventeen million, three hundred thirty-two thousand, five hundred eighty-one".