684076381 has 2 divisors, whose sum is σ = 684076382. Its totient is φ = 684076380.

The previous prime is 684076369. The next prime is 684076397. The reversal of 684076381 is 183670486.

684076381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671587225 + 12489156 = 25915^2 + 3534^2 .

It is a cyclic number.

It is not a de Polignac number, because 684076381 - 2²¹ = 681979229 is a prime.

It is a super-2 number, since 2×684076381² = 935920990084114322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684076181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342038190 + 342038191.

It is an arithmetic number, because the mean of its divisors is an integer number (342038191).

Almost surely, 2^684076381 is an apocalyptic number.

It is an amenable number.

684076381 is a deficient number, since it is larger than the sum of its proper divisors (1).

684076381 is an equidigital number, since it uses as much as digits as its factorization.

684076381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 684076381 is about 26154.8538707445. The cubic root of 684076381 is about 881.1196067088.

The spelling of 684076381 in words is "six hundred eighty-four million, seventy-six thousand, three hundred eighty-one".