685178241 has 8 divisors (see below), whose sum is σ = 996622944. Its totient is φ = 415259520.

The previous prime is 685178227. The next prime is 685178261. The reversal of 685178241 is 142871586.

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

It is not a de Polignac number, because 685178241 - 2¹⁰ = 685177217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 685178193 and 685178202.

It is not an unprimeable number, because it can be changed into a prime (685178261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10381456 + ... + 10381521.

It is an arithmetic number, because the mean of its divisors is an integer number (124577868).

Almost surely, 2^685178241 is an apocalyptic number.

It is an amenable number.

685178241 is a deficient number, since it is larger than the sum of its proper divisors (311444703).

685178241 is a wasteful number, since it uses less digits than its factorization.

685178241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20762991.

The product of its digits is 107520, while the sum is 42.

The square root of 685178241 is about 26175.9095543975. The cubic root of 685178241 is about 881.5924338540.

The spelling of 685178241 in words is "six hundred eighty-five million, one hundred seventy-eight thousand, two hundred forty-one".