168278231 has 8 divisors (see below), whose sum is σ = 193238400. Its totient is φ = 144928440.

The previous prime is 168278191. The next prime is 168278239. The reversal of 168278231 is 132872861.

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

It is a cyclic number.

It is not a de Polignac number, because 168278231 - 2⁶ = 168278167 is a prime.

It is a super-2 number, since 2×168278231² = 56635126056978722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168278239) 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, 402371 + ... + 402788.

It is an arithmetic number, because the mean of its divisors is an integer number (24154800).

Almost surely, 2^168278231 is an apocalyptic number.

168278231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

168278231 is a deficient number, since it is larger than the sum of its proper divisors (24960169).

168278231 is a wasteful number, since it uses less digits than its factorization.

168278231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805189.

The product of its digits is 32256, while the sum is 38.

The square root of 168278231 is about 12972.2099505057. The cubic root of 168278231 is about 552.0892776817.

The spelling of 168278231 in words is "one hundred sixty-eight million, two hundred seventy-eight thousand, two hundred thirty-one".