684947099 has 2 divisors, whose sum is σ = 684947100. Its totient is φ = 684947098.

The previous prime is 684947083. The next prime is 684947149. The reversal of 684947099 is 990749486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684947099 - 2⁴ = 684947083 is a prime.

It is not a weakly prime, because it can be changed into another prime (684947009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342473549 + 342473550.

It is an arithmetic number, because the mean of its divisors is an integer number (342473550).

Almost surely, 2^684947099 is an apocalyptic number.

684947099 is a deficient number, since it is larger than the sum of its proper divisors (1).

684947099 is an equidigital number, since it uses as much as digits as its factorization.

684947099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 684947099 is about 26171.4940154360. The cubic root of 684947099 is about 881.4932888702.

The spelling of 684947099 in words is "six hundred eighty-four million, nine hundred forty-seven thousand, ninety-nine".