687563741 has 2 divisors, whose sum is σ = 687563742. Its totient is φ = 687563740.

The previous prime is 687563707. The next prime is 687563819. The reversal of 687563741 is 147365786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641608900 + 45954841 = 25330^2 + 6779^2 .

It is a cyclic number.

It is not a de Polignac number, because 687563741 - 2⁶ = 687563677 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 (687563441) 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, 343781870 + 343781871.

It is an arithmetic number, because the mean of its divisors is an integer number (343781871).

Almost surely, 2^687563741 is an apocalyptic number.

It is an amenable number.

687563741 is a deficient number, since it is larger than the sum of its proper divisors (1).

687563741 is an equidigital number, since it uses as much as digits as its factorization.

687563741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 47.

The square root of 687563741 is about 26221.4366692598. The cubic root of 687563741 is about 882.6143591017.

The spelling of 687563741 in words is "six hundred eighty-seven million, five hundred sixty-three thousand, seven hundred forty-one".