1688871887 has 2 divisors, whose sum is σ = 1688871888. Its totient is φ = 1688871886.

The previous prime is 1688871883. The next prime is 1688871889. The reversal of 1688871887 is 7881788861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1688871887 - 2² = 1688871883 is a prime.

Together with 1688871889, 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 (1688871883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844435943 + 844435944.

It is an arithmetic number, because the mean of its divisors is an integer number (844435944).

Almost surely, 2^1688871887 is an apocalyptic number.

1688871887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688871887 is an equidigital number, since it uses as much as digits as its factorization.

1688871887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9633792, while the sum is 62.

The square root of 1688871887 is about 41095.8864973126. The cubic root of 1688871887 is about 1190.8733289745.

The spelling of 1688871887 in words is "one billion, six hundred eighty-eight million, eight hundred seventy-one thousand, eight hundred eighty-seven".