684141947 has 2 divisors, whose sum is σ = 684141948. Its totient is φ = 684141946.

The previous prime is 684141919. The next prime is 684141977. The reversal of 684141947 is 749141486.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684141947 - 2¹⁸ = 683879803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 684141898 and 684141907.

It is not a weakly prime, because it can be changed into another prime (684141977) 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, 342070973 + 342070974.

It is an arithmetic number, because the mean of its divisors is an integer number (342070974).

Almost surely, 2^684141947 is an apocalyptic number.

684141947 is a deficient number, since it is larger than the sum of its proper divisors (1).

684141947 is an equidigital number, since it uses as much as digits as its factorization.

684141947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 684141947 is about 26156.1072600645. The cubic root of 684141947 is about 881.1477564126.

The spelling of 684141947 in words is "six hundred eighty-four million, one hundred forty-one thousand, nine hundred forty-seven".