168731397 has 16 divisors (see below), whose sum is σ = 253399680. Its totient is φ = 110945376.

The previous prime is 168731369. The next prime is 168731413. The reversal of 168731397 is 793137861.

It is not a de Polignac number, because 168731397 - 2⁶ = 168731333 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168731317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40833 + ... + 44774.

It is an arithmetic number, because the mean of its divisors is an integer number (15837480).

Almost surely, 2^168731397 is an apocalyptic number.

It is an amenable number.

168731397 is a deficient number, since it is larger than the sum of its proper divisors (84668283).

168731397 is an equidigital number, since it uses as much as digits as its factorization.

168731397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85689 (or 85683 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 168731397 is about 12989.6650072279. The cubic root of 168731397 is about 552.5844176682.

The spelling of 168731397 in words is "one hundred sixty-eight million, seven hundred thirty-one thousand, three hundred ninety-seven".