684684901 has 2 divisors, whose sum is σ = 684684902. Its totient is φ = 684684900.

The previous prime is 684684883. The next prime is 684684919. The reversal of 684684901 is 109486486.

It is a balanced prime because it is at equal distance from previous prime (684684883) and next prime (684684919).

It can be written as a sum of positive squares in only one way, i.e., 682567876 + 2117025 = 26126^2 + 1455^2 .

It is a cyclic number.

It is not a de Polignac number, because 684684901 - 2¹⁹ = 684160613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684684971) 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, 342342450 + 342342451.

It is an arithmetic number, because the mean of its divisors is an integer number (342342451).

Almost surely, 2^684684901 is an apocalyptic number.

It is an amenable number.

684684901 is a deficient number, since it is larger than the sum of its proper divisors (1).

684684901 is an equidigital number, since it uses as much as digits as its factorization.

684684901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 684684901 is about 26166.4843072202. The cubic root of 684684901 is about 881.3807958638.

The spelling of 684684901 in words is "six hundred eighty-four million, six hundred eighty-four thousand, nine hundred one".