168873391 has 2 divisors, whose sum is σ = 168873392. Its totient is φ = 168873390.

The previous prime is 168873389. The next prime is 168873401. The reversal of 168873391 is 193378861.

168873391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168873391 - 2¹ = 168873389 is a prime.

Together with 168873389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168873361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84436695 + 84436696.

It is an arithmetic number, because the mean of its divisors is an integer number (84436696).

Almost surely, 2^168873391 is an apocalyptic number.

168873391 is a deficient number, since it is larger than the sum of its proper divisors (1).

168873391 is an equidigital number, since it uses as much as digits as its factorization.

168873391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 168873391 is about 12995.1295107052. The cubic root of 168873391 is about 552.7393812640.

The spelling of 168873391 in words is "one hundred sixty-eight million, eight hundred seventy-three thousand, three hundred ninety-one".