168868891 has 2 divisors, whose sum is σ = 168868892. Its totient is φ = 168868890.

The previous prime is 168868823. The next prime is 168868907. The reversal of 168868891 is 198868861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168868891 - 2¹¹ = 168866843 is a prime.

It is not a weakly prime, because it can be changed into another prime (168868291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84434445 + 84434446.

It is an arithmetic number, because the mean of its divisors is an integer number (84434446).

Almost surely, 2^168868891 is an apocalyptic number.

168868891 is a deficient number, since it is larger than the sum of its proper divisors (1).

168868891 is an equidigital number, since it uses as much as digits as its factorization.

168868891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1327104, while the sum is 55.

The square root of 168868891 is about 12994.9563677605. The cubic root of 168868891 is about 552.7344715714.

The spelling of 168868891 in words is "one hundred sixty-eight million, eight hundred sixty-eight thousand, eight hundred ninety-one".