646121302 has 16 divisors (see below), whose sum is σ = 981942192. Its totient is φ = 318816000.

The previous prime is 646121297. The next prime is 646121309. The reversal of 646121302 is 203121646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646121309) 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 in 7 ways as a sum of consecutive naturals, for example, 213802 + ... + 216802.

It is an arithmetic number, because the mean of its divisors is an integer number (61371387).

Almost surely, 2^646121302 is an apocalyptic number.

646121302 is a deficient number, since it is larger than the sum of its proper divisors (335820890).

646121302 is a wasteful number, since it uses less digits than its factorization.

646121302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4383.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 646121302 is about 25418.9162239463. The cubic root of 646121302 is about 864.5126513998.

Adding to 646121302 its reverse (203121646), we get a palindrome (849242948).

The spelling of 646121302 in words is "six hundred forty-six million, one hundred twenty-one thousand, three hundred two".