168171397 has 8 divisors (see below), whose sum is σ = 169618680. Its totient is φ = 166729920.

The previous prime is 168171379. The next prime is 168171427. The reversal of 168171397 is 793171861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32821441 + 135349956 = 5729^2 + 11634^2 .

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 168171397 - 2¹¹ = 168169349 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 (168171307) 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 7 ways as a sum of consecutive naturals, for example, 71679 + ... + 73987.

It is an arithmetic number, because the mean of its divisors is an integer number (21202335).

Almost surely, 2^168171397 is an apocalyptic number.

It is an amenable number.

168171397 is a deficient number, since it is larger than the sum of its proper divisors (1447283).

168171397 is a wasteful number, since it uses less digits than its factorization.

168171397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903.

The product of its digits is 63504, while the sum is 43.

The square root of 168171397 is about 12968.0914941251. The cubic root of 168171397 is about 551.9724188505.

The spelling of 168171397 in words is "one hundred sixty-eight million, one hundred seventy-one thousand, three hundred ninety-seven".