168101891 has 2 divisors, whose sum is σ = 168101892. Its totient is φ = 168101890.

The previous prime is 168101887. The next prime is 168101953. The reversal of 168101891 is 198101861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168101891 - 2² = 168101887 is a prime.

168101891 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (168101821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84050945 + 84050946.

It is an arithmetic number, because the mean of its divisors is an integer number (84050946).

Almost surely, 2^168101891 is an apocalyptic number.

168101891 is a deficient number, since it is larger than the sum of its proper divisors (1).

168101891 is an equidigital number, since it uses as much as digits as its factorization.

168101891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 35.

The square root of 168101891 is about 12965.4113316933. The cubic root of 168101891 is about 551.8963641381.

The spelling of 168101891 in words is "one hundred sixty-eight million, one hundred one thousand, eight hundred ninety-one".