679961 has 2 divisors, whose sum is σ = 679962. Its totient is φ = 679960.

The previous prime is 679957. The next prime is 679969. The reversal of 679961 is 169976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 414736 + 265225 = 644^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 679961 - 2² = 679957 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 679961.

It is not a weakly prime, because it can be changed into another prime (679969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339980 + 339981.

It is an arithmetic number, because the mean of its divisors is an integer number (339981).

2⁶⁷⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

679961 is a deficient number, since it is larger than the sum of its proper divisors (1).

679961 is an equidigital number, since it uses as much as digits as its factorization.

679961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 679961 is about 824.5974775610. The cubic root of 679961 is about 87.9349122703.

The spelling of 679961 in words is "six hundred seventy-nine thousand, nine hundred sixty-one".