168987671 has 4 divisors (see below), whose sum is σ = 170628432. Its totient is φ = 167346912.

The previous prime is 168987659. The next prime is 168987697. The reversal of 168987671 is 176789861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168987671 - 2¹⁴ = 168971287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168987631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820226 + ... + 820431.

It is an arithmetic number, because the mean of its divisors is an integer number (42657108).

Almost surely, 2^168987671 is an apocalyptic number.

168987671 is a deficient number, since it is larger than the sum of its proper divisors (1640761).

168987671 is a wasteful number, since it uses less digits than its factorization.

168987671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640760.

The product of its digits is 1016064, while the sum is 53.

The square root of 168987671 is about 12999.5257990436. The cubic root of 168987671 is about 552.8640364128.

The spelling of 168987671 in words is "one hundred sixty-eight million, nine hundred eighty-seven thousand, six hundred seventy-one".