685354273 has 4 divisors (see below), whose sum is σ = 685552660. Its totient is φ = 685155888.

The previous prime is 685354213. The next prime is 685354277. The reversal of 685354273 is 372453586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 372453586 = 2 ⋅186226793.

It can be written as a sum of positive squares in 2 ways, for example, as 650862144 + 34492129 = 25512^2 + 5873^2 .

It is a cyclic number.

It is not a de Polignac number, because 685354273 - 2²¹ = 683257121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685354277) 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, 93918 + ... + 100951.

It is an arithmetic number, because the mean of its divisors is an integer number (171388165).

Almost surely, 2^685354273 is an apocalyptic number.

It is an amenable number.

685354273 is a deficient number, since it is larger than the sum of its proper divisors (198387).

685354273 is a wasteful number, since it uses less digits than its factorization.

685354273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198386.

The product of its digits is 604800, while the sum is 43.

The square root of 685354273 is about 26179.2718195140. The cubic root of 685354273 is about 881.6679252526.

The spelling of 685354273 in words is "six hundred eighty-five million, three hundred fifty-four thousand, two hundred seventy-three".