644130413 has 2 divisors, whose sum is σ = 644130414. Its totient is φ = 644130412.

The previous prime is 644130349. The next prime is 644130437. The reversal of 644130413 is 314031446.

644130413 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., 595994569 + 48135844 = 24413^2 + 6938^2 .

It is a cyclic number.

It is not a de Polignac number, because 644130413 - 2⁶ = 644130349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644130313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322065206 + 322065207.

It is an arithmetic number, because the mean of its divisors is an integer number (322065207).

Almost surely, 2^644130413 is an apocalyptic number.

It is an amenable number.

644130413 is a deficient number, since it is larger than the sum of its proper divisors (1).

644130413 is an equidigital number, since it uses as much as digits as its factorization.

644130413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 644130413 is about 25379.7244468887. The cubic root of 644130413 is about 863.6237989284.

Adding to 644130413 its reverse (314031446), we get a palindrome (958161859).

The spelling of 644130413 in words is "six hundred forty-four million, one hundred thirty thousand, four hundred thirteen".