1317211523 has 4 divisors (see below), whose sum is σ = 1362632640. Its totient is φ = 1271790408.

The previous prime is 1317211517. The next prime is 1317211529. The reversal of 1317211523 is 3251127131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3251127131 = 7 ⋅464446733.

It is an interprime number because it is at equal distance from previous prime (1317211517) and next prime (1317211529).

It is a cyclic number.

It is not a de Polignac number, because 1317211523 - 2²⁴ = 1300434307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1317211492 and 1317211501.

It is not an unprimeable number, because it can be changed into a prime (1317211529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22710515 + ... + 22710572.

It is an arithmetic number, because the mean of its divisors is an integer number (340658160).

Almost surely, 2^1317211523 is an apocalyptic number.

1317211523 is a deficient number, since it is larger than the sum of its proper divisors (45421117).

1317211523 is an equidigital number, since it uses as much as digits as its factorization.

1317211523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45421116.

The product of its digits is 1260, while the sum is 26.

The square root of 1317211523 is about 36293.4088093141. The cubic root of 1317211523 is about 1096.1883287090.

Adding to 1317211523 its reverse (3251127131), we get a palindrome (4568338654).

The spelling of 1317211523 in words is "one billion, three hundred seventeen million, two hundred eleven thousand, five hundred twenty-three".