684039101 has 2 divisors, whose sum is σ = 684039102. Its totient is φ = 684039100.

The previous prime is 684039079. The next prime is 684039107. The reversal of 684039101 is 101930486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363664900 + 320374201 = 19070^2 + 17899^2 .

It is a cyclic number.

It is not a de Polignac number, because 684039101 - 2¹⁰ = 684038077 is a prime.

It is a Chen prime.

It is equal to p_35468420 and since 684039101 and 35468420 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684039107) 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, 342019550 + 342019551.

It is an arithmetic number, because the mean of its divisors is an integer number (342019551).

Almost surely, 2^684039101 is an apocalyptic number.

It is an amenable number.

684039101 is a deficient number, since it is larger than the sum of its proper divisors (1).

684039101 is an equidigital number, since it uses as much as digits as its factorization.

684039101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 684039101 is about 26154.1411826120. The cubic root of 684039101 is about 881.1036003404.

Adding to 684039101 its reverse (101930486), we get a palindrome (785969587).

The spelling of 684039101 in words is "six hundred eighty-four million, thirty-nine thousand, one hundred one".