684141919 has 2 divisors, whose sum is σ = 684141920. Its totient is φ = 684141918.

The previous prime is 684141893. The next prime is 684141947. The reversal of 684141919 is 919141486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684141919 - 2¹¹ = 684139871 is a prime.

It is a super-2 number, since 2×684141919² = 936100330666005122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684144919) 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, 342070959 + 342070960.

It is an arithmetic number, because the mean of its divisors is an integer number (342070960).

Almost surely, 2^684141919 is an apocalyptic number.

684141919 is a deficient number, since it is larger than the sum of its proper divisors (1).

684141919 is an equidigital number, since it uses as much as digits as its factorization.

684141919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The square root of 684141919 is about 26156.1067248167. The cubic root of 684141919 is about 881.1477443916.

The spelling of 684141919 in words is "six hundred eighty-four million, one hundred forty-one thousand, nine hundred nineteen".