165728197 has 2 divisors, whose sum is σ = 165728198. Its totient is φ = 165728196.

The previous prime is 165728183. The next prime is 165728237. The reversal of 165728197 is 791827561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108180801 + 57547396 = 10401^2 + 7586^2 .

It is a cyclic number.

It is not a de Polignac number, because 165728197 - 2¹⁵ = 165695429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165728107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82864098 + 82864099.

It is an arithmetic number, because the mean of its divisors is an integer number (82864099).

Almost surely, 2^165728197 is an apocalyptic number.

It is an amenable number.

165728197 is a deficient number, since it is larger than the sum of its proper divisors (1).

165728197 is an equidigital number, since it uses as much as digits as its factorization.

165728197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 46.

The square root of 165728197 is about 12873.5464033808. The cubic root of 165728197 is about 549.2863438126.

The spelling of 165728197 in words is "one hundred sixty-five million, seven hundred twenty-eight thousand, one hundred ninety-seven".