685277897 has 4 divisors (see below), whose sum is σ = 685369476. Its totient is φ = 685186320.

The previous prime is 685277867. The next prime is 685277911. The reversal of 685277897 is 798772586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798772586 = 2 ⋅399386293.

It can be written as a sum of positive squares in 2 ways, for example, as 559748281 + 125529616 = 23659^2 + 11204^2 .

It is a cyclic number.

It is not a de Polignac number, because 685277897 - 2⁶ = 685277833 is a prime.

It is a super-2 number, since 2×685277897² = 939211592233485218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685277867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33458 + ... + 49899.

It is an arithmetic number, because the mean of its divisors is an integer number (171342369).

Almost surely, 2^685277897 is an apocalyptic number.

It is an amenable number.

685277897 is a deficient number, since it is larger than the sum of its proper divisors (91579).

685277897 is an equidigital number, since it uses as much as digits as its factorization.

685277897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91578.

The product of its digits is 11854080, while the sum is 59.

The square root of 685277897 is about 26177.8130675578. The cubic root of 685277897 is about 881.6351729600.

The spelling of 685277897 in words is "six hundred eighty-five million, two hundred seventy-seven thousand, eight hundred ninety-seven".