168621009 has 8 divisors (see below), whose sum is σ = 224917440. Its totient is φ = 112369296.

The previous prime is 168621001. The next prime is 168621023. The reversal of 168621009 is 900126861.

168621009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 168621009 - 2³ = 168621001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168621001) 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, 1074 + ... + 18395.

It is an arithmetic number, because the mean of its divisors is an integer number (28114680).

Almost surely, 2^168621009 is an apocalyptic number.

It is an amenable number.

168621009 is a deficient number, since it is larger than the sum of its proper divisors (56296431).

168621009 is a wasteful number, since it uses less digits than its factorization.

168621009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22359.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 168621009 is about 12985.4152417241. The cubic root of 168621009 is about 552.4638868583.

It can be divided in two parts, 16862 and 1009, that added together give a palindrome (17871).

The spelling of 168621009 in words is "one hundred sixty-eight million, six hundred twenty-one thousand, nine".