681983 has 2 divisors, whose sum is σ = 681984. Its totient is φ = 681982.

The previous prime is 681979. The next prime is 681997. The reversal of 681983 is 389186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681983 - 2² = 681979 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 (681913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340991 + 340992.

It is an arithmetic number, because the mean of its divisors is an integer number (340992).

2⁶⁸¹⁹⁸³ is an apocalyptic number.

681983 is a deficient number, since it is larger than the sum of its proper divisors (1).

681983 is an equidigital number, since it uses as much as digits as its factorization.

681983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 681983 is about 825.8226201794. The cubic root of 681983 is about 88.0219900279.

The spelling of 681983 in words is "six hundred eighty-one thousand, nine hundred eighty-three".