168358909 has 4 divisors (see below), whose sum is σ = 168444640. Its totient is φ = 168273180.

The previous prime is 168358903. The next prime is 168358913. The reversal of 168358909 is 909853861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909853861 = 7 ⋅129979123.

It is a cyclic number.

It is not a de Polignac number, because 168358909 - 2⁵ = 168358877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168358903) 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, 39849 + ... + 43870.

It is an arithmetic number, because the mean of its divisors is an integer number (42111160).

Almost surely, 2^168358909 is an apocalyptic number.

It is an amenable number.

168358909 is a deficient number, since it is larger than the sum of its proper divisors (85731).

168358909 is an equidigital number, since it uses as much as digits as its factorization.

168358909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85730.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 168358909 is about 12975.3192253601. The cubic root of 168358909 is about 552.1774933749.

The spelling of 168358909 in words is "one hundred sixty-eight million, three hundred fifty-eight thousand, nine hundred nine".