1317743549 has 2 divisors, whose sum is σ = 1317743550. Its totient is φ = 1317743548.

The previous prime is 1317743543. The next prime is 1317743551. The reversal of 1317743549 is 9453477131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684868900 + 632874649 = 26170^2 + 25157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317743549 - 2¹⁶ = 1317678013 is a prime.

It is a super-2 number, since 2×1317743549² = 3472896121862230802, which contains 22 as substring.

Together with 1317743551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317743543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658871774 + 658871775.

It is an arithmetic number, because the mean of its divisors is an integer number (658871775).

Almost surely, 2^1317743549 is an apocalyptic number.

It is an amenable number.

1317743549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317743549 is an equidigital number, since it uses as much as digits as its factorization.

1317743549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 1317743549 is about 36300.7375820382. The cubic root of 1317743549 is about 1096.3358935155.

The spelling of 1317743549 in words is "one billion, three hundred seventeen million, seven hundred forty-three thousand, five hundred forty-nine".