616813313 has 2 divisors, whose sum is σ = 616813314. Its totient is φ = 616813312.

The previous prime is 616813303. The next prime is 616813367. The reversal of 616813313 is 313318616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616677889 + 135424 = 24833^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 616813313 - 2⁴ = 616813297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 616813313.

It is not a weakly prime, because it can be changed into another prime (616813303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308406656 + 308406657.

It is an arithmetic number, because the mean of its divisors is an integer number (308406657).

Almost surely, 2^616813313 is an apocalyptic number.

It is an amenable number.

616813313 is a deficient number, since it is larger than the sum of its proper divisors (1).

616813313 is an equidigital number, since it uses as much as digits as its factorization.

616813313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 616813313 is about 24835.7265446373. The cubic root of 616813313 is about 851.2384774363.

The spelling of 616813313 in words is "six hundred sixteen million, eight hundred thirteen thousand, three hundred thirteen".