1316505205 has 8 divisors (see below), whose sum is σ = 1595448504. Its totient is φ = 1042776000.

The previous prime is 1316505191. The next prime is 1316505227. The reversal of 1316505205 is 5025056131.

It can be written as a sum of positive squares in 4 ways, for example, as 165328164 + 1151177041 = 12858^2 + 33929^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1316505205 - 2¹⁷ = 1316374133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302966 + ... + 1303975.

It is an arithmetic number, because the mean of its divisors is an integer number (199431063).

Almost surely, 2^1316505205 is an apocalyptic number.

It is an amenable number.

1316505205 is a deficient number, since it is larger than the sum of its proper divisors (278943299).

1316505205 is a wasteful number, since it uses less digits than its factorization.

1316505205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2607047.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1316505205 is about 36283.6768395928. The cubic root of 1316505205 is about 1095.9923601884.

It can be divided in two parts, 1316 and 505205, that added together give a triangular number (506521 = T₁₀₀₆).

The spelling of 1316505205 in words is "one billion, three hundred sixteen million, five hundred five thousand, two hundred five".