684876061 has 2 divisors, whose sum is σ = 684876062. Its totient is φ = 684876060.

The previous prime is 684876029. The next prime is 684876067. The reversal of 684876061 is 160678486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506520036 + 178356025 = 22506^2 + 13355^2 .

It is a cyclic number.

It is not a de Polignac number, because 684876061 - 2⁵ = 684876029 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684876067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342438030 + 342438031.

It is an arithmetic number, because the mean of its divisors is an integer number (342438031).

Almost surely, 2^684876061 is an apocalyptic number.

It is an amenable number.

684876061 is a deficient number, since it is larger than the sum of its proper divisors (1).

684876061 is an equidigital number, since it uses as much as digits as its factorization.

684876061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 684876061 is about 26170.1368166084. The cubic root of 684876061 is about 881.4628136772.

The spelling of 684876061 in words is "six hundred eighty-four million, eight hundred seventy-six thousand, sixty-one".