616560389 has 2 divisors, whose sum is σ = 616560390. Its totient is φ = 616560388.

The previous prime is 616560253. The next prime is 616560463. The reversal of 616560389 is 983065616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602309764 + 14250625 = 24542^2 + 3775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616560389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616560589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308280194 + 308280195.

It is an arithmetic number, because the mean of its divisors is an integer number (308280195).

Almost surely, 2^616560389 is an apocalyptic number.

It is an amenable number.

616560389 is a deficient number, since it is larger than the sum of its proper divisors (1).

616560389 is an equidigital number, since it uses as much as digits as its factorization.

616560389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 616560389 is about 24830.6340837281. The cubic root of 616560389 is about 851.1221115546.

The spelling of 616560389 in words is "six hundred sixteen million, five hundred sixty thousand, three hundred eighty-nine".