687431741 has 2 divisors, whose sum is σ = 687431742. Its totient is φ = 687431740.

The previous prime is 687431713. The next prime is 687431807. The reversal of 687431741 is 147134786.

687431741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406869241 + 280562500 = 20171^2 + 16750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687431741 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 (687431441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343715870 + 343715871.

It is an arithmetic number, because the mean of its divisors is an integer number (343715871).

Almost surely, 2^687431741 is an apocalyptic number.

It is an amenable number.

687431741 is a deficient number, since it is larger than the sum of its proper divisors (1).

687431741 is an equidigital number, since it uses as much as digits as its factorization.

687431741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 41.

The square root of 687431741 is about 26218.9195238858. The cubic root of 687431741 is about 882.5578734045.

The spelling of 687431741 in words is "six hundred eighty-seven million, four hundred thirty-one thousand, seven hundred forty-one".