616619321 has 2 divisors, whose sum is σ = 616619322. Its totient is φ = 616619320.

The previous prime is 616619317. The next prime is 616619363. The reversal of 616619321 is 123916616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544708921 + 71910400 = 23339^2 + 8480^2 .

It is a cyclic number.

It is not a de Polignac number, because 616619321 - 2² = 616619317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (616619371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308309660 + 308309661.

It is an arithmetic number, because the mean of its divisors is an integer number (308309661).

Almost surely, 2^616619321 is an apocalyptic number.

It is an amenable number.

616619321 is a deficient number, since it is larger than the sum of its proper divisors (1).

616619321 is an equidigital number, since it uses as much as digits as its factorization.

616619321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 616619321 is about 24831.8207346944. The cubic root of 616619321 is about 851.1492279740.

The spelling of 616619321 in words is "six hundred sixteen million, six hundred nineteen thousand, three hundred twenty-one".