685571813 has 8 divisors (see below), whose sum is σ = 723307200. Its totient is φ = 648001728.

The previous prime is 685571807. The next prime is 685571819. The reversal of 685571813 is 318175586.

It is an interprime number because it is at equal distance from previous prime (685571807) and next prime (685571819).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685571813 - 2¹⁶ = 685506277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685571819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32756 + ... + 49437.

It is an arithmetic number, because the mean of its divisors is an integer number (90413400).

Almost surely, 2^685571813 is an apocalyptic number.

It is an amenable number.

685571813 is a deficient number, since it is larger than the sum of its proper divisors (37735387).

685571813 is a wasteful number, since it uses less digits than its factorization.

685571813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82651.

The product of its digits is 201600, while the sum is 44.

The square root of 685571813 is about 26183.4263036754. The cubic root of 685571813 is about 881.7611995189.

The spelling of 685571813 in words is "six hundred eighty-five million, five hundred seventy-one thousand, eight hundred thirteen".