1285315805 has 8 divisors (see below), whose sum is σ = 1584065112. Its totient is φ = 1000461888.

The previous prime is 1285315789. The next prime is 1285315813. The reversal of 1285315805 is 5085135821.

It can be written as a sum of positive squares in 4 ways, for example, as 291111844 + 994203961 = 17062^2 + 31531^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1285315805 - 2⁴ = 1285315789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3473642 + ... + 3474011.

It is an arithmetic number, because the mean of its divisors is an integer number (198008139).

Almost surely, 2^1285315805 is an apocalyptic number.

It is an amenable number.

1285315805 is a deficient number, since it is larger than the sum of its proper divisors (298749307).

1285315805 is an equidigital number, since it uses as much as digits as its factorization.

1285315805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6947695.

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 1285315805 is about 35851.3013013475. The cubic root of 1285315805 is about 1087.2680243304.

The spelling of 1285315805 in words is "one billion, two hundred eighty-five million, three hundred fifteen thousand, eight hundred five".