1317211517 has 2 divisors, whose sum is σ = 1317211518. Its totient is φ = 1317211516.

The previous prime is 1317211487. The next prime is 1317211529. The reversal of 1317211517 is 7151127131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1314135001 + 3076516 = 36251^2 + 1754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317211517 - 2¹⁰ = 1317210493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1317211517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317214517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658605758 + 658605759.

It is an arithmetic number, because the mean of its divisors is an integer number (658605759).

Almost surely, 2^1317211517 is an apocalyptic number.

It is an amenable number.

1317211517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317211517 is an equidigital number, since it uses as much as digits as its factorization.

1317211517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1470, while the sum is 29.

The square root of 1317211517 is about 36293.4087266545. The cubic root of 1317211517 is about 1096.1883270446.

Adding to 1317211517 its reverse (7151127131), we get a palindrome (8468338648).

The spelling of 1317211517 in words is "one billion, three hundred seventeen million, two hundred eleven thousand, five hundred seventeen".