168922009 has 9 divisors (see below), whose sum is σ = 173690461. Its totient is φ = 164282080.

The previous prime is 168922001. The next prime is 168922021. The reversal of 168922009 is 900229861.

The square root of 168922009 is 12997.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 135606025 + 33315984 = 11645^2 + 5772^2 .

It is not a de Polignac number, because 168922009 - 2³ = 168922001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168922001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 532719 + ... + 533035.

Almost surely, 2^168922009 is an apocalyptic number.

168922009 is the 12997-th square number.

168922009 is the 6499-th centered octagonal number.

It is an amenable number.

168922009 is a deficient number, since it is larger than the sum of its proper divisors (4768452).

168922009 is an frugal number, since it uses more digits than its factorization.

168922009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The cubic root of 168922009 is about 552.7924200220.

The spelling of 168922009 in words is "one hundred sixty-eight million, nine hundred twenty-two thousand, nine".