1285107709 has 2 divisors, whose sum is σ = 1285107710. Its totient is φ = 1285107708.

The previous prime is 1285107689. The next prime is 1285107743. The reversal of 1285107709 is 9077015821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1275204100 + 9903609 = 35710^2 + 3147^2 .

It is an emirp because it is prime and its reverse (9077015821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285107709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285105709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642553854 + 642553855.

It is an arithmetic number, because the mean of its divisors is an integer number (642553855).

Almost surely, 2^1285107709 is an apocalyptic number.

It is an amenable number.

1285107709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285107709 is an equidigital number, since it uses as much as digits as its factorization.

1285107709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 1285107709 is about 35848.3989740128. The cubic root of 1285107709 is about 1087.2093439818.

The spelling of 1285107709 in words is "one billion, two hundred eighty-five million, one hundred seven thousand, seven hundred nine".