1005665189 has 2 divisors, whose sum is σ = 1005665190. Its totient is φ = 1005665188.

The previous prime is 1005665183. The next prime is 1005665191. The reversal of 1005665189 is 9815665001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536292964 + 469372225 = 23158^2 + 21665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005665189 is a prime.

It is a super-2 number, since 2×1005665189² = 2022724944732811442, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1005665191, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005665183) 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, 502832594 + 502832595.

It is an arithmetic number, because the mean of its divisors is an integer number (502832595).

Almost surely, 2^1005665189 is an apocalyptic number.

It is an amenable number.

1005665189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005665189 is an equidigital number, since it uses as much as digits as its factorization.

1005665189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 1005665189 is about 31712.2245987253. The cubic root of 1005665189 is about 1001.8848414739.

The spelling of 1005665189 in words is "one billion, five million, six hundred sixty-five thousand, one hundred eighty-nine".