168186397 has 2 divisors, whose sum is σ = 168186398. Its totient is φ = 168186396.

The previous prime is 168186383. The next prime is 168186401. The reversal of 168186397 is 793681861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167676601 + 509796 = 12949^2 + 714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168186397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168186397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168186307) 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 as a sum of consecutive naturals, namely, 84093198 + 84093199.

It is an arithmetic number, because the mean of its divisors is an integer number (84093199).

Almost surely, 2^168186397 is an apocalyptic number.

It is an amenable number.

168186397 is a deficient number, since it is larger than the sum of its proper divisors (1).

168186397 is an equidigital number, since it uses as much as digits as its factorization.

168186397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 168186397 is about 12968.6698238486. The cubic root of 168186397 is about 551.9888293703.

The spelling of 168186397 in words is "one hundred sixty-eight million, one hundred eighty-six thousand, three hundred ninety-seven".