1285045209 has 16 divisors (see below), whose sum is σ = 2175738240. Its totient is φ = 734311440.

The previous prime is 1285045199. The next prime is 1285045217. The reversal of 1285045209 is 9025405821.

1285045209 is a `hidden beast` number, since 128 + 5 + 0 + 4 + 520 + 9 = 666.

1285045209 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1285045209 - 2⁷ = 1285045081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285045609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3399402 + ... + 3399779.

It is an arithmetic number, because the mean of its divisors is an integer number (135983640).

Almost surely, 2^1285045209 is an apocalyptic number.

It is an amenable number.

1285045209 is a deficient number, since it is larger than the sum of its proper divisors (890693031).

1285045209 is an equidigital number, since it uses as much as digits as its factorization.

1285045209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6799197 (or 6799191 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1285045209 is about 35847.5272368960. The cubic root of 1285045209 is about 1087.1917185628.

The spelling of 1285045209 in words is "one billion, two hundred eighty-five million, forty-five thousand, two hundred nine".