665089 has 2 divisors, whose sum is σ = 665090. Its totient is φ = 665088.

The previous prime is 665069. The next prime is 665111. The reversal of 665089 is 980566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 146689 = 720^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 665089 - 2¹⁵ = 632321 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (665029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332544 + 332545.

It is an arithmetic number, because the mean of its divisors is an integer number (332545).

2⁶⁶⁵⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

665089 is a deficient number, since it is larger than the sum of its proper divisors (1).

665089 is an equidigital number, since it uses as much as digits as its factorization.

665089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 665089 is about 815.5298890905. The cubic root of 665089 is about 87.2890811038.

The spelling of 665089 in words is "six hundred sixty-five thousand, eighty-nine".