168888901 has 2 divisors, whose sum is σ = 168888902. Its totient is φ = 168888900.

The previous prime is 168888893. The next prime is 168888911. The reversal of 168888901 is 109888861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127916100 + 40972801 = 11310^2 + 6401^2 .

It is an emirp because it is prime and its reverse (109888861) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 106888891 and 198888601.

It is a cyclic number.

It is not a de Polignac number, because 168888901 - 2³ = 168888893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168888911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84444450 + 84444451.

It is an arithmetic number, because the mean of its divisors is an integer number (84444451).

Almost surely, 2^168888901 is an apocalyptic number.

It is an amenable number.

168888901 is a deficient number, since it is larger than the sum of its proper divisors (1).

168888901 is an equidigital number, since it uses as much as digits as its factorization.

168888901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 49.

The square root of 168888901 is about 12995.7262590438. The cubic root of 168888901 is about 552.7563026695.

The spelling of 168888901 in words is "one hundred sixty-eight million, eight hundred eighty-eight thousand, nine hundred one".