616910813 has 2 divisors, whose sum is σ = 616910814. Its totient is φ = 616910812.

The previous prime is 616910803. The next prime is 616910837. The reversal of 616910813 is 318019616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 569204164 + 47706649 = 23858^2 + 6907^2 .

It is a cyclic number.

It is not a de Polignac number, because 616910813 - 2¹⁰ = 616909789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616910803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308455406 + 308455407.

It is an arithmetic number, because the mean of its divisors is an integer number (308455407).

Almost surely, 2^616910813 is an apocalyptic number.

It is an amenable number.

616910813 is a deficient number, since it is larger than the sum of its proper divisors (1).

616910813 is an equidigital number, since it uses as much as digits as its factorization.

616910813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 616910813 is about 24837.6893651563. The cubic root of 616910813 is about 851.2833269757.

The spelling of 616910813 in words is "six hundred sixteen million, nine hundred ten thousand, eight hundred thirteen".