684856117 has 4 divisors (see below), whose sum is σ = 747115776. Its totient is φ = 622596460.

The previous prime is 684856099. The next prime is 684856127. The reversal of 684856117 is 711658486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684856117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684856127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31129813 + ... + 31129834.

It is an arithmetic number, because the mean of its divisors is an integer number (186778944).

Almost surely, 2^684856117 is an apocalyptic number.

It is an amenable number.

684856117 is a deficient number, since it is larger than the sum of its proper divisors (62259659).

684856117 is a wasteful number, since it uses less digits than its factorization.

684856117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62259658.

The product of its digits is 322560, while the sum is 46.

The square root of 684856117 is about 26169.7557688260. The cubic root of 684856117 is about 881.4542573529.

The spelling of 684856117 in words is "six hundred eighty-four million, eight hundred fifty-six thousand, one hundred seventeen".