1128002809 has 4 divisors (see below), whose sum is σ = 1129135204. Its totient is φ = 1126870416.

The previous prime is 1128002801. The next prime is 1128002833. The reversal of 1128002809 is 9082008211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 793661584 + 334341225 = 28172^2 + 18285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128002809 - 2³ = 1128002801 is a prime.

It is a super-2 number, since 2×1128002809² = 2544780674223780962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128002801) 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 in 3 ways as a sum of consecutive naturals, for example, 564702 + ... + 566695.

It is an arithmetic number, because the mean of its divisors is an integer number (282283801).

Almost surely, 2^1128002809 is an apocalyptic number.

It is an amenable number.

1128002809 is a deficient number, since it is larger than the sum of its proper divisors (1132395).

1128002809 is an equidigital number, since it uses as much as digits as its factorization.

1128002809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132394.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1128002809 is about 33585.7530658462. The cubic root of 1128002809 is about 1040.9664367657.

The spelling of 1128002809 in words is "one billion, one hundred twenty-eight million, two thousand, eight hundred nine".