685177393 has 2 divisors, whose sum is σ = 685177394. Its totient is φ = 685177392.

The previous prime is 685177387. The next prime is 685177417. The reversal of 685177393 is 393771586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476461584 + 208715809 = 21828^2 + 14447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685177393 is a prime.

It is not a weakly prime, because it can be changed into another prime (685177303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342588696 + 342588697.

It is an arithmetic number, because the mean of its divisors is an integer number (342588697).

Almost surely, 2^685177393 is an apocalyptic number.

It is an amenable number.

685177393 is a deficient number, since it is larger than the sum of its proper divisors (1).

685177393 is an equidigital number, since it uses as much as digits as its factorization.

685177393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 49.

The square root of 685177393 is about 26175.8933562925. The cubic root of 685177393 is about 881.5920701575.

The spelling of 685177393 in words is "six hundred eighty-five million, one hundred seventy-seven thousand, three hundred ninety-three".