616600321 has 2 divisors, whose sum is σ = 616600322. Its totient is φ = 616600320.

The previous prime is 616600241. The next prime is 616600337. The reversal of 616600321 is 123006616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611869696 + 4730625 = 24736^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 616600321 - 2¹⁹ = 616076033 is a prime.

It is not a weakly prime, because it can be changed into another prime (616600381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308300160 + 308300161.

It is an arithmetic number, because the mean of its divisors is an integer number (308300161).

Almost surely, 2^616600321 is an apocalyptic number.

It is an amenable number.

616600321 is a deficient number, since it is larger than the sum of its proper divisors (1).

616600321 is an equidigital number, since it uses as much as digits as its factorization.

616600321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 616600321 is about 24831.4381581092. The cubic root of 616600321 is about 851.1404856804.

Adding to 616600321 its reverse (123006616), we get a palindrome (739606937).

The spelling of 616600321 in words is "six hundred sixteen million, six hundred thousand, three hundred twenty-one".