616561597 has 2 divisors, whose sum is σ = 616561598. Its totient is φ = 616561596.

The previous prime is 616561579. The next prime is 616561601. The reversal of 616561597 is 795165616.

Together with previous prime (616561579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560221561 + 56340036 = 23669^2 + 7506^2 .

It is a cyclic number.

It is not a de Polignac number, because 616561597 - 2¹¹ = 616559549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616561397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308280798 + 308280799.

It is an arithmetic number, because the mean of its divisors is an integer number (308280799).

Almost surely, 2^616561597 is an apocalyptic number.

It is an amenable number.

616561597 is a deficient number, since it is larger than the sum of its proper divisors (1).

616561597 is an equidigital number, since it uses as much as digits as its factorization.

616561597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 46.

The square root of 616561597 is about 24830.6584085078. The cubic root of 616561597 is about 851.1226674097.

The spelling of 616561597 in words is "six hundred sixteen million, five hundred sixty-one thousand, five hundred ninety-seven".