1316505805 has 8 divisors (see below), whose sum is σ = 1585638144. Its totient is φ = 1049317200.

The previous prime is 1316505803. The next prime is 1316505833. The reversal of 1316505805 is 5085056131.

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

It is not a de Polignac number, because 1316505805 - 2¹ = 1316505803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316505803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484441 + ... + 487150.

It is an arithmetic number, because the mean of its divisors is an integer number (198204768).

Almost surely, 2^1316505805 is an apocalyptic number.

It is an amenable number.

1316505805 is a deficient number, since it is larger than the sum of its proper divisors (269132339).

1316505805 is an equidigital number, since it uses as much as digits as its factorization.

1316505805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971867.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1316505805 is about 36283.6851077726. The cubic root of 1316505805 is about 1095.9925266886.

The spelling of 1316505805 in words is "one billion, three hundred sixteen million, five hundred five thousand, eight hundred five".