646630297 has 2 divisors, whose sum is σ = 646630298. Its totient is φ = 646630296.

The previous prime is 646630261. The next prime is 646630307. The reversal of 646630297 is 792036646.

646630297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376981056 + 269649241 = 19416^2 + 16421^2 .

It is a cyclic number.

It is not a de Polignac number, because 646630297 - 2¹⁹ = 646106009 is a prime.

It is not a weakly prime, because it can be changed into another prime (646630997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323315148 + 323315149.

It is an arithmetic number, because the mean of its divisors is an integer number (323315149).

Almost surely, 2^646630297 is an apocalyptic number.

It is an amenable number.

646630297 is a deficient number, since it is larger than the sum of its proper divisors (1).

646630297 is an equidigital number, since it uses as much as digits as its factorization.

646630297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 646630297 is about 25428.9263831566. The cubic root of 646630297 is about 864.7396042016.

It can be divided in two parts, 6466 and 30297, that added together give a palindrome (36763).

The spelling of 646630297 in words is "six hundred forty-six million, six hundred thirty thousand, two hundred ninety-seven".