646811413 has 2 divisors, whose sum is σ = 646811414. Its totient is φ = 646811412.

The previous prime is 646811411. The next prime is 646811419. The reversal of 646811413 is 314118646.

646811413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529782289 + 117029124 = 23017^2 + 10818^2 .

It is a cyclic number.

It is not a de Polignac number, because 646811413 - 2¹ = 646811411 is a prime.

Together with 646811411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646811411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323405706 + 323405707.

It is an arithmetic number, because the mean of its divisors is an integer number (323405707).

Almost surely, 2^646811413 is an apocalyptic number.

It is an amenable number.

646811413 is a deficient number, since it is larger than the sum of its proper divisors (1).

646811413 is an equidigital number, since it uses as much as digits as its factorization.

646811413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 646811413 is about 25432.4873537765. The cubic root of 646811413 is about 864.8203322253.

The spelling of 646811413 in words is "six hundred forty-six million, eight hundred eleven thousand, four hundred thirteen".