646145441 has 2 divisors, whose sum is σ = 646145442. Its totient is φ = 646145440.

The previous prime is 646145377. The next prime is 646145443. The reversal of 646145441 is 144541646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 550887841 + 95257600 = 23471^2 + 9760^2 .

It is a cyclic number.

It is not a de Polignac number, because 646145441 - 2⁶ = 646145377 is a prime.

Together with 646145443, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646145443) 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, 323072720 + 323072721.

It is an arithmetic number, because the mean of its divisors is an integer number (323072721).

Almost surely, 2^646145441 is an apocalyptic number.

It is an amenable number.

646145441 is a deficient number, since it is larger than the sum of its proper divisors (1).

646145441 is an equidigital number, since it uses as much as digits as its factorization.

646145441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 35.

The square root of 646145441 is about 25419.3910430600. The cubic root of 646145441 is about 864.5234172890.

It can be divided in two parts, 64 and 6145441, that multiplied together give a square (393308224 = 19832²).

The spelling of 646145441 in words is "six hundred forty-six million, one hundred forty-five thousand, four hundred forty-one".