168097921 has 8 divisors (see below), whose sum is σ = 187354080. Its totient is φ = 149882688.

The previous prime is 168097913. The next prime is 168097931. The reversal of 168097921 is 129790861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168097921 - 2³ = 168097913 is a prime.

It is a super-2 number, since 2×168097921² = 56513822089044482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168097931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259891 + ... + 260536.

It is an arithmetic number, because the mean of its divisors is an integer number (23419260).

Almost surely, 2^168097921 is an apocalyptic number.

It is an amenable number.

168097921 is a deficient number, since it is larger than the sum of its proper divisors (19256159).

168097921 is a wasteful number, since it uses less digits than its factorization.

168097921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520463.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 168097921 is about 12965.2582311345. The cubic root of 168097921 is about 551.8920194600.

The spelling of 168097921 in words is "one hundred sixty-eight million, ninety-seven thousand, nine hundred twenty-one".