168323891 has 2 divisors, whose sum is σ = 168323892. Its totient is φ = 168323890.

The previous prime is 168323879. The next prime is 168323927. The reversal of 168323891 is 198323861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168323891 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168323191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84161945 + 84161946.

It is an arithmetic number, because the mean of its divisors is an integer number (84161946).

Almost surely, 2^168323891 is an apocalyptic number.

168323891 is a deficient number, since it is larger than the sum of its proper divisors (1).

168323891 is an equidigital number, since it uses as much as digits as its factorization.

168323891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 168323891 is about 12973.9697471514. The cubic root of 168323891 is about 552.1392071281.

The spelling of 168323891 in words is "one hundred sixty-eight million, three hundred twenty-three thousand, eight hundred ninety-one".