168117893 has 4 divisors (see below), whose sum is σ = 168249408. Its totient is φ = 167986380.

The previous prime is 168117889. The next prime is 168117907. The reversal of 168117893 is 398711861.

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: 398711861 = 277 ⋅1439393.

It is a cyclic number.

It is not a de Polignac number, because 168117893 - 2² = 168117889 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 (168117823) 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, 63821 + ... + 66402.

It is an arithmetic number, because the mean of its divisors is an integer number (42062352).

Almost surely, 2^168117893 is an apocalyptic number.

It is an amenable number.

168117893 is a deficient number, since it is larger than the sum of its proper divisors (131515).

168117893 is a wasteful number, since it uses less digits than its factorization.

168117893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131514.

The product of its digits is 72576, while the sum is 44.

The square root of 168117893 is about 12966.0284204532. The cubic root of 168117893 is about 551.9138756711.

The spelling of 168117893 in words is "one hundred sixty-eight million, one hundred seventeen thousand, eight hundred ninety-three".