687036641 has 2 divisors, whose sum is σ = 687036642. Its totient is φ = 687036640.

The previous prime is 687036619. The next prime is 687036659. The reversal of 687036641 is 146630786.

687036641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654592225 + 32444416 = 25585^2 + 5696^2 .

It is a cyclic number.

It is not a de Polignac number, because 687036641 - 2⁶ = 687036577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687036041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343518320 + 343518321.

It is an arithmetic number, because the mean of its divisors is an integer number (343518321).

Almost surely, 2^687036641 is an apocalyptic number.

It is an amenable number.

687036641 is a deficient number, since it is larger than the sum of its proper divisors (1).

687036641 is an equidigital number, since it uses as much as digits as its factorization.

687036641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 687036641 is about 26211.3838055147. The cubic root of 687036641 is about 882.3887582178.

The spelling of 687036641 in words is "six hundred eighty-seven million, thirty-six thousand, six hundred forty-one".