1285445305 has 16 divisors (see below), whose sum is σ = 1614127824. Its totient is φ = 981676800.

The previous prime is 1285445303. The next prime is 1285445309. The reversal of 1285445305 is 5035445821.

It can be written as a sum of positive squares in 8 ways, for example, as 72386064 + 1213059241 = 8508^2 + 34829^2 .

It is not a de Polignac number, because 1285445305 - 2¹ = 1285445303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285445303) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 55746 + ... + 75355.

It is an arithmetic number, because the mean of its divisors is an integer number (100882989).

It is a Poulet number, since it divides 2^1285445304-1.

Almost surely, 2^1285445305 is an apocalyptic number.

It is an amenable number.

1285445305 is a deficient number, since it is larger than the sum of its proper divisors (328682519).

1285445305 is a wasteful number, since it uses less digits than its factorization.

1285445305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131196.

The product of its (nonzero) digits is 96000, while the sum is 37.

The square root of 1285445305 is about 35853.1073269807. The cubic root of 1285445305 is about 1087.3045384385.

The spelling of 1285445305 in words is "one billion, two hundred eighty-five million, four hundred forty-five thousand, three hundred five".