613920817 has 2 divisors, whose sum is σ = 613920818. Its totient is φ = 613920816.

The previous prime is 613920803. The next prime is 613920877. The reversal of 613920817 is 718029316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412252416 + 201668401 = 20304^2 + 14201^2 .

It is a cyclic number.

It is not a de Polignac number, because 613920817 - 2¹⁹ = 613396529 is a prime.

It is not a weakly prime, because it can be changed into another prime (613920877) 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, 306960408 + 306960409.

It is an arithmetic number, because the mean of its divisors is an integer number (306960409).

Almost surely, 2^613920817 is an apocalyptic number.

It is an amenable number.

613920817 is a deficient number, since it is larger than the sum of its proper divisors (1).

613920817 is an equidigital number, since it uses as much as digits as its factorization.

613920817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 613920817 is about 24777.4255523047. The cubic root of 613920817 is about 849.9057874819.

The spelling of 613920817 in words is "six hundred thirteen million, nine hundred twenty thousand, eight hundred seventeen".