684141977 has 2 divisors, whose sum is σ = 684141978. Its totient is φ = 684141976.

The previous prime is 684141947. The next prime is 684142003. The reversal of 684141977 is 779141486.

It is a happy number.

684141977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 618467161 + 65674816 = 24869^2 + 8104^2 .

It is a cyclic number.

It is not a de Polignac number, because 684141977 - 2¹⁶ = 684076441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (684141947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342070988 + 342070989.

It is an arithmetic number, because the mean of its divisors is an integer number (342070989).

Almost surely, 2^684141977 is an apocalyptic number.

It is an amenable number.

684141977 is a deficient number, since it is larger than the sum of its proper divisors (1).

684141977 is an equidigital number, since it uses as much as digits as its factorization.

684141977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 684141977 is about 26156.1078335443. The cubic root of 684141977 is about 881.1477692922.

The spelling of 684141977 in words is "six hundred eighty-four million, one hundred forty-one thousand, nine hundred seventy-seven".