662309 has 2 divisors, whose sum is σ = 662310. Its totient is φ = 662308.

The previous prime is 662287. The next prime is 662323. The reversal of 662309 is 903266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 494209 + 168100 = 703^2 + 410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-662309 is a prime.

It is a super-2 number, since 2×662309² = 877306422962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 662309.

It is not a weakly prime, because it can be changed into another prime (662339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331154 + 331155.

It is an arithmetic number, because the mean of its divisors is an integer number (331155).

2⁶⁶²³⁰⁹ is an apocalyptic number.

It is an amenable number.

662309 is a deficient number, since it is larger than the sum of its proper divisors (1).

662309 is an equidigital number, since it uses as much as digits as its factorization.

662309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 662309 is about 813.8236909798. The cubic root of 662309 is about 87.1672916213.

The spelling of 662309 in words is "six hundred sixty-two thousand, three hundred nine".