685480513 has 4 divisors (see below), whose sum is σ = 685533268. Its totient is φ = 685427760.

The previous prime is 685480489. The next prime is 685480529. The reversal of 685480513 is 315084586.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 315084586 = 2 ⋅157542293.

It can be written as a sum of positive squares in 2 ways, for example, as 200732224 + 484748289 = 14168^2 + 22017^2 .

It is a cyclic number.

It is not a de Polignac number, because 685480513 - 2²¹ = 683383361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685480583) 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, 8383 + ... + 37963.

It is an arithmetic number, because the mean of its divisors is an integer number (171383317).

Almost surely, 2^685480513 is an apocalyptic number.

It is an amenable number.

685480513 is a deficient number, since it is larger than the sum of its proper divisors (52755).

685480513 is a wasteful number, since it uses less digits than its factorization.

685480513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52754.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 685480513 is about 26181.6827763228. The cubic root of 685480513 is about 881.7220553719.

The spelling of 685480513 in words is "six hundred eighty-five million, four hundred eighty thousand, five hundred thirteen".