646266241 has 2 divisors, whose sum is σ = 646266242. Its totient is φ = 646266240.

The previous prime is 646266233. The next prime is 646266253. The reversal of 646266241 is 142662646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327465216 + 318801025 = 18096^2 + 17855^2 .

It is a cyclic number.

It is not a de Polignac number, because 646266241 - 2³ = 646266233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646266241.

It is not a weakly prime, because it can be changed into another prime (646266281) 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, 323133120 + 323133121.

It is an arithmetic number, because the mean of its divisors is an integer number (323133121).

Almost surely, 2^646266241 is an apocalyptic number.

It is an amenable number.

646266241 is a deficient number, since it is larger than the sum of its proper divisors (1).

646266241 is an equidigital number, since it uses as much as digits as its factorization.

646266241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 37.

The square root of 646266241 is about 25421.7670707604. The cubic root of 646266241 is about 864.5772895364.

The spelling of 646266241 in words is "six hundred forty-six million, two hundred sixty-six thousand, two hundred forty-one".