168049921 has 4 divisors (see below), whose sum is σ = 180976852. Its totient is φ = 155122992.

The previous prime is 168049919. The next prime is 168049963. The reversal of 168049921 is 129940861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49000000 + 119049921 = 7000^2 + 10911^2 .

It is a cyclic number.

It is not a de Polignac number, because 168049921 - 2¹ = 168049919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168049421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6463446 + ... + 6463471.

It is an arithmetic number, because the mean of its divisors is an integer number (45244213).

Almost surely, 2^168049921 is an apocalyptic number.

It is an amenable number.

168049921 is a deficient number, since it is larger than the sum of its proper divisors (12926931).

168049921 is a wasteful number, since it uses less digits than its factorization.

168049921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12926930.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 168049921 is about 12963.4069981622. The cubic root of 168049921 is about 551.8394839326.

The spelling of 168049921 in words is "one hundred sixty-eight million, forty-nine thousand, nine hundred twenty-one".