1688506871 has 2 divisors, whose sum is σ = 1688506872. Its totient is φ = 1688506870.

The previous prime is 1688506849. The next prime is 1688506873. The reversal of 1688506871 is 1786058861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1688506871 - 2²⁶ = 1621398007 is a prime.

It is a Sophie Germain prime.

Together with 1688506873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688506873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844253435 + 844253436.

It is an arithmetic number, because the mean of its divisors is an integer number (844253436).

Almost surely, 2^1688506871 is an apocalyptic number.

1688506871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688506871 is an equidigital number, since it uses as much as digits as its factorization.

1688506871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 1688506871 is about 41091.4452289038. The cubic root of 1688506871 is about 1190.7875282807.

The spelling of 1688506871 in words is "one billion, six hundred eighty-eight million, five hundred six thousand, eight hundred seventy-one".