1288016809 has 4 divisors (see below), whose sum is σ = 1288103940. Its totient is φ = 1287929680.

The previous prime is 1288016789. The next prime is 1288016833. The reversal of 1288016809 is 9086108821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 616429584 + 671587225 = 24828^2 + 25915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288016809 - 2⁹ = 1288016297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288016839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15262 + ... + 52999.

It is an arithmetic number, because the mean of its divisors is an integer number (322025985).

Almost surely, 2^1288016809 is an apocalyptic number.

It is an amenable number.

1288016809 is a deficient number, since it is larger than the sum of its proper divisors (87131).

1288016809 is an equidigital number, since it uses as much as digits as its factorization.

1288016809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87130.

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 1288016809 is about 35888.9510713256. The cubic root of 1288016809 is about 1088.0290981373.

The spelling of 1288016809 in words is "one billion, two hundred eighty-eight million, sixteen thousand, eight hundred nine".