687300409 has 2 divisors, whose sum is σ = 687300410. Its totient is φ = 687300408.

The previous prime is 687300407. The next prime is 687300413. The reversal of 687300409 is 904003786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376554025 + 310746384 = 19405^2 + 17628^2 .

It is a cyclic number.

It is not a de Polignac number, because 687300409 - 2¹ = 687300407 is a prime.

Together with 687300407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (687300403) 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, 343650204 + 343650205.

It is an arithmetic number, because the mean of its divisors is an integer number (343650205).

Almost surely, 2^687300409 is an apocalyptic number.

It is an amenable number.

687300409 is a deficient number, since it is larger than the sum of its proper divisors (1).

687300409 is an equidigital number, since it uses as much as digits as its factorization.

687300409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 687300409 is about 26216.4148769430. The cubic root of 687300409 is about 882.5016663826.

The spelling of 687300409 in words is "six hundred eighty-seven million, three hundred thousand, four hundred nine".