168487691 has 2 divisors, whose sum is σ = 168487692. Its totient is φ = 168487690.

The previous prime is 168487667. The next prime is 168487747. The reversal of 168487691 is 196784861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168487691 - 2¹⁴ = 168471307 is a prime.

It is a super-2 number, since 2×168487691² = 56776204037022962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168486691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84243845 + 84243846.

It is an arithmetic number, because the mean of its divisors is an integer number (84243846).

Almost surely, 2^168487691 is an apocalyptic number.

168487691 is a deficient number, since it is larger than the sum of its proper divisors (1).

168487691 is an equidigital number, since it uses as much as digits as its factorization.

168487691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The square root of 168487691 is about 12980.2808521233. The cubic root of 168487691 is about 552.3182490155.

The spelling of 168487691 in words is "one hundred sixty-eight million, four hundred eighty-seven thousand, six hundred ninety-one".