168892921 has 2 divisors, whose sum is σ = 168892922. Its totient is φ = 168892920.

The previous prime is 168892903. The next prime is 168892951. The reversal of 168892921 is 129298861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143137296 + 25755625 = 11964^2 + 5075^2 .

It is a cyclic number.

It is not a de Polignac number, because 168892921 - 2⁷ = 168892793 is a prime.

It is not a weakly prime, because it can be changed into another prime (168892951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84446460 + 84446461.

It is an arithmetic number, because the mean of its divisors is an integer number (84446461).

Almost surely, 2^168892921 is an apocalyptic number.

It is an amenable number.

168892921 is a deficient number, since it is larger than the sum of its proper divisors (1).

168892921 is an equidigital number, since it uses as much as digits as its factorization.

168892921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 168892921 is about 12995.8809243545. The cubic root of 168892921 is about 552.7606883192.

The spelling of 168892921 in words is "one hundred sixty-eight million, eight hundred ninety-two thousand, nine hundred twenty-one".