1089809321 has 2 divisors, whose sum is σ = 1089809322. Its totient is φ = 1089809320.

The previous prime is 1089809297. The next prime is 1089809323. The reversal of 1089809321 is 1239089801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628204096 + 461605225 = 25064^2 + 21485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089809321 is a prime.

It is a super-2 number, since 2×1089809321² = 2375368712276962082, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1089809323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1089809323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544904660 + 544904661.

It is an arithmetic number, because the mean of its divisors is an integer number (544904661).

Almost surely, 2^1089809321 is an apocalyptic number.

It is an amenable number.

1089809321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089809321 is an equidigital number, since it uses as much as digits as its factorization.

1089809321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1089809321 is about 33012.2601619459. The cubic root of 1089809321 is about 1029.0824521066.

The spelling of 1089809321 in words is "one billion, eighty-nine million, eight hundred nine thousand, three hundred twenty-one".