1688133871 has 2 divisors, whose sum is σ = 1688133872. Its totient is φ = 1688133870.

The previous prime is 1688133859. The next prime is 1688133961. The reversal of 1688133871 is 1783318861.

It is a weak prime.

It is an emirp because it is prime and its reverse (1783318861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1688133871 - 2⁷ = 1688133743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688134871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844066935 + 844066936.

It is an arithmetic number, because the mean of its divisors is an integer number (844066936).

Almost surely, 2^1688133871 is an apocalyptic number.

1688133871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688133871 is an equidigital number, since it uses as much as digits as its factorization.

1688133871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 46.

The square root of 1688133871 is about 41086.9063206273. The cubic root of 1688133871 is about 1190.6998380920.

The spelling of 1688133871 in words is "one billion, six hundred eighty-eight million, one hundred thirty-three thousand, eight hundred seventy-one".