684854109 has 20 divisors (see below), whose sum is σ = 1023771804. Its totient is φ = 456249024.

The previous prime is 684854089. The next prime is 684854113. The reversal of 684854109 is 901458486.

684854109 is a `hidden beast` number, since 68 + 48 + 541 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 168428484 + 516425625 = 12978^2 + 22725^2 .

It is not a de Polignac number, because 684854109 - 2⁹ = 684853597 is a prime.

It is a super-2 number, since 2×684854109² = 938050301228367762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684854609) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 190759 + ... + 194315.

Almost surely, 2^684854109 is an apocalyptic number.

It is an amenable number.

684854109 is a deficient number, since it is larger than the sum of its proper divisors (338917695).

684854109 is a wasteful number, since it uses less digits than its factorization.

684854109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946 (or 5937 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 684854109 is about 26169.7174039003. The cubic root of 684854109 is about 881.4533958766.

The spelling of 684854109 in words is "six hundred eighty-four million, eight hundred fifty-four thousand, one hundred nine".