1688173087 has 2 divisors, whose sum is σ = 1688173088. Its totient is φ = 1688173086.

The previous prime is 1688173057. The next prime is 1688173121. The reversal of 1688173087 is 7803718861.

It is a weak prime.

It is an emirp because it is prime and its reverse (7803718861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1688173087 - 2¹⁵ = 1688140319 is a prime.

It is a super-2 number, since 2×1688173087² = 5699856743342219138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1688173087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688173007) 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, 844086543 + 844086544.

It is an arithmetic number, because the mean of its divisors is an integer number (844086544).

Almost surely, 2^1688173087 is an apocalyptic number.

1688173087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688173087 is an equidigital number, since it uses as much as digits as its factorization.

1688173087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 1688173087 is about 41087.3835501848. The cubic root of 1688173087 is about 1190.7090581592.

The spelling of 1688173087 in words is "one billion, six hundred eighty-eight million, one hundred seventy-three thousand, eighty-seven".