685888597 has 2 divisors, whose sum is σ = 685888598. Its totient is φ = 685888596.

The previous prime is 685888583. The next prime is 685888603. The reversal of 685888597 is 795888586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581726161 + 104162436 = 24119^2 + 10206^2 .

It is a cyclic number.

It is not a de Polignac number, because 685888597 - 2¹¹ = 685886549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685888517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342944298 + 342944299.

It is an arithmetic number, because the mean of its divisors is an integer number (342944299).

Almost surely, 2^685888597 is an apocalyptic number.

It is an amenable number.

685888597 is a deficient number, since it is larger than the sum of its proper divisors (1).

685888597 is an equidigital number, since it uses as much as digits as its factorization.

685888597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38707200, while the sum is 64.

The square root of 685888597 is about 26189.4749279171. The cubic root of 685888597 is about 881.8969911906.

The spelling of 685888597 in words is "six hundred eighty-five million, eight hundred eighty-eight thousand, five hundred ninety-seven".