1317252605 has 24 divisors (see below), whose sum is σ = 1625267592. Its totient is φ = 1024800000.

The previous prime is 1317252593. The next prime is 1317252611. The reversal of 1317252605 is 5062527131.

It can be written as a sum of positive squares in 12 ways, for example, as 385965316 + 931287289 = 19646^2 + 30517^2 .

It is not a de Polignac number, because 1317252605 - 2¹⁰ = 1317251581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1878755 + ... + 1879455.

It is an arithmetic number, because the mean of its divisors is an integer number (67719483).

Almost surely, 2^1317252605 is an apocalyptic number.

It is an amenable number.

1317252605 is a deficient number, since it is larger than the sum of its proper divisors (308014987).

1317252605 is an equidigital number, since it uses as much as digits as its factorization.

1317252605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1317252605 is about 36293.9747754362. The cubic root of 1317252605 is about 1096.1997247883.

Adding to 1317252605 its reverse (5062527131), we get a palindrome (6379779736).

The spelling of 1317252605 in words is "one billion, three hundred seventeen million, two hundred fifty-two thousand, six hundred five".