1317742997 has 2 divisors, whose sum is σ = 1317742998. Its totient is φ = 1317742996.

The previous prime is 1317742961. The next prime is 1317743023. The reversal of 1317742997 is 7992477131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 961062001 + 356680996 = 31001^2 + 18886^2 .

It is an emirp because it is prime and its reverse (7992477131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1317742997 is a prime.

It is a super-2 number, since 2×1317742997² = 3472893212285084018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317742957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658871498 + 658871499.

It is an arithmetic number, because the mean of its divisors is an integer number (658871499).

Almost surely, 2^1317742997 is an apocalyptic number.

It is an amenable number.

1317742997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317742997 is an equidigital number, since it uses as much as digits as its factorization.

1317742997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 50.

The square root of 1317742997 is about 36300.7299788861. The cubic root of 1317742997 is about 1096.3357404312.

The spelling of 1317742997 in words is "one billion, three hundred seventeen million, seven hundred forty-two thousand, nine hundred ninety-seven".