168238881 has 6 divisors (see below), whose sum is σ = 243011730. Its totient is φ = 112159248.

The previous prime is 168238879. The next prime is 168238927. The reversal of 168238881 is 188832861.

It can be written as a sum of positive squares in only one way, i.e., 167573025 + 665856 = 12945^2 + 816^2 .

It is not a de Polignac number, because 168238881 - 2¹ = 168238879 is a prime.

It is a super-2 number, since 2×168238881² = 56608642160264322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168238841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9346596 + ... + 9346613.

It is an arithmetic number, because the mean of its divisors is an integer number (40501955).

Almost surely, 2^168238881 is an apocalyptic number.

It is an amenable number.

168238881 is a deficient number, since it is larger than the sum of its proper divisors (74772849).

168238881 is a wasteful number, since it uses less digits than its factorization.

168238881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18693215 (or 18693212 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 168238881 is about 12970.6931580390. The cubic root of 168238881 is about 552.0462410066.

The spelling of 168238881 in words is "one hundred sixty-eight million, two hundred thirty-eight thousand, eight hundred eighty-one".