646267 has 2 divisors, whose sum is σ = 646268. Its totient is φ = 646266.

The previous prime is 646259. The next prime is 646271. The reversal of 646267 is 762646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646267 - 2³ = 646259 is a prime.

It is a super-2 number, since 2×646267² = 835322070578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323133 + 323134.

It is an arithmetic number, because the mean of its divisors is an integer number (323134).

2⁶⁴⁶²⁶⁷ is an apocalyptic number.

646267 is a deficient number, since it is larger than the sum of its proper divisors (1).

646267 is an equidigital number, since it uses as much as digits as its factorization.

646267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 646267 is about 803.9073329682. The cubic root of 646267 is about 86.4577628001.

The spelling of 646267 in words is "six hundred forty-six thousand, two hundred sixty-seven".