687655099 has 2 divisors, whose sum is σ = 687655100. Its totient is φ = 687655098.

The previous prime is 687655079. The next prime is 687655153. The reversal of 687655099 is 990556786.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687655099 - 2⁹ = 687654587 is a prime.

It is not a weakly prime, because it can be changed into another prime (687655009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343827549 + 343827550.

It is an arithmetic number, because the mean of its divisors is an integer number (343827550).

Almost surely, 2^687655099 is an apocalyptic number.

687655099 is a deficient number, since it is larger than the sum of its proper divisors (1).

687655099 is an equidigital number, since it uses as much as digits as its factorization.

687655099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The square root of 687655099 is about 26223.1786593464. The cubic root of 687655099 is about 882.6534489619.

The spelling of 687655099 in words is "six hundred eighty-seven million, six hundred fifty-five thousand, ninety-nine".