687041 has 2 divisors, whose sum is σ = 687042. Its totient is φ = 687040.

The previous prime is 687031. The next prime is 687061. The reversal of 687041 is 140786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 14641 = 820^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 687041 - 2⁶ = 686977 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 687041.

It is not a weakly prime, because it can be changed into another prime (687031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343520 + 343521.

It is an arithmetic number, because the mean of its divisors is an integer number (343521).

2⁶⁸⁷⁰⁴¹ is an apocalyptic number.

It is an amenable number.

687041 is a deficient number, since it is larger than the sum of its proper divisors (1).

687041 is an equidigital number, since it uses as much as digits as its factorization.

687041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 687041 is about 828.8793639608. The cubic root of 687041 is about 88.2390624360.

The spelling of 687041 in words is "six hundred eighty-seven thousand, forty-one".