684128597 has 2 divisors, whose sum is σ = 684128598. Its totient is φ = 684128596.

The previous prime is 684128539. The next prime is 684128617. The reversal of 684128597 is 795821486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657358321 + 26770276 = 25639^2 + 5174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684128597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684128507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342064298 + 342064299.

It is an arithmetic number, because the mean of its divisors is an integer number (342064299).

Almost surely, 2^684128597 is an apocalyptic number.

It is an amenable number.

684128597 is a deficient number, since it is larger than the sum of its proper divisors (1).

684128597 is an equidigital number, since it uses as much as digits as its factorization.

684128597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The square root of 684128597 is about 26155.8520602943. The cubic root of 684128597 is about 881.1420249514.

The spelling of 684128597 in words is "six hundred eighty-four million, one hundred twenty-eight thousand, five hundred ninety-seven".