646830269 has 2 divisors, whose sum is σ = 646830270. Its totient is φ = 646830268.

The previous prime is 646830257. The next prime is 646830323. The reversal of 646830269 is 962038646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643636900 + 3193369 = 25370^2 + 1787^2 .

It is a cyclic number.

It is not a de Polignac number, because 646830269 - 2⁴ = 646830253 is a prime.

It is a super-2 number, since 2×646830269² = 836778793789224722, which contains 22 as substring.

It is a Sophie Germain prime.

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 (646830169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323415134 + 323415135.

It is an arithmetic number, because the mean of its divisors is an integer number (323415135).

Almost surely, 2^646830269 is an apocalyptic number.

It is an amenable number.

646830269 is a deficient number, since it is larger than the sum of its proper divisors (1).

646830269 is an equidigital number, since it uses as much as digits as its factorization.

646830269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 646830269 is about 25432.8580580319. The cubic root of 646830269 is about 864.8287359596.

The spelling of 646830269 in words is "six hundred forty-six million, eight hundred thirty thousand, two hundred sixty-nine".