687205741 has 2 divisors, whose sum is σ = 687205742. Its totient is φ = 687205740.

The previous prime is 687205711. The next prime is 687205751. The reversal of 687205741 is 147502786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656845641 + 30360100 = 25629^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 687205741 - 2⁵ = 687205709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687205694 and 687205703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687205711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343602870 + 343602871.

It is an arithmetic number, because the mean of its divisors is an integer number (343602871).

Almost surely, 2^687205741 is an apocalyptic number.

It is an amenable number.

687205741 is a deficient number, since it is larger than the sum of its proper divisors (1).

687205741 is an equidigital number, since it uses as much as digits as its factorization.

687205741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 687205741 is about 26214.6093047369. The cubic root of 687205741 is about 882.4611462536.

The spelling of 687205741 in words is "six hundred eighty-seven million, two hundred five thousand, seven hundred forty-one".