168357121 has 2 divisors, whose sum is σ = 168357122. Its totient is φ = 168357120.

The previous prime is 168357109. The next prime is 168357173. The reversal of 168357121 is 121753861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161798400 + 6558721 = 12720^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 168357121 - 2¹¹ = 168355073 is a prime.

It is equal to p_9416293 and since 168357121 and 9416293 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (168357191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84178560 + 84178561.

It is an arithmetic number, because the mean of its divisors is an integer number (84178561).

Almost surely, 2^168357121 is an apocalyptic number.

It is an amenable number.

168357121 is a deficient number, since it is larger than the sum of its proper divisors (1).

168357121 is an equidigital number, since it uses as much as digits as its factorization.

168357121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 168357121 is about 12975.2503251382. The cubic root of 168357121 is about 552.1755386287.

The spelling of 168357121 in words is "one hundred sixty-eight million, three hundred fifty-seven thousand, one hundred twenty-one".