616722839 has 2 divisors, whose sum is σ = 616722840. Its totient is φ = 616722838.

The previous prime is 616722791. The next prime is 616722857. The reversal of 616722839 is 938227616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616722839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616722839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616722859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308361419 + 308361420.

It is an arithmetic number, because the mean of its divisors is an integer number (308361420).

Almost surely, 2^616722839 is an apocalyptic number.

616722839 is a deficient number, since it is larger than the sum of its proper divisors (1).

616722839 is an equidigital number, since it uses as much as digits as its factorization.

616722839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 616722839 is about 24833.9050292136. The cubic root of 616722839 is about 851.1968555959.

The spelling of 616722839 in words is "six hundred sixteen million, seven hundred twenty-two thousand, eight hundred thirty-nine".