1285401209 has 12 divisors (see below), whose sum is σ = 1342185852. Its totient is φ = 1230278400.

The previous prime is 1285401203. The next prime is 1285401217. The reversal of 1285401209 is 9021045821.

It can be written as a sum of positive squares in 6 ways, for example, as 170041600 + 1115359609 = 13040^2 + 33397^2 .

It is not a de Polignac number, because 1285401209 - 2²⁸ = 1016965753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285401203) 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 11 ways as a sum of consecutive naturals, for example, 109589 + ... + 120749.

It is an arithmetic number, because the mean of its divisors is an integer number (111848821).

Almost surely, 2^1285401209 is an apocalyptic number.

It is an amenable number.

1285401209 is a deficient number, since it is larger than the sum of its proper divisors (56784643).

1285401209 is an equidigital number, since it uses as much as digits as its factorization.

1285401209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11308 (or 11255 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1285401209 is about 35852.4923680349. The cubic root of 1285401209 is about 1087.2921053076.

The spelling of 1285401209 in words is "one billion, two hundred eighty-five million, four hundred one thousand, two hundred nine".