165749 has 2 divisors, whose sum is σ = 165750. Its totient is φ = 165748.

The previous prime is 165721. The next prime is 165779. The reversal of 165749 is 947561.

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., 165649 + 100 = 407^2 + 10^2 .

It is an emirp because it is prime and its reverse (947561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165749 - 2¹⁶ = 100213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82874 + 82875.

It is an arithmetic number, because the mean of its divisors is an integer number (82875).

2¹⁶⁵⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

165749 is a deficient number, since it is larger than the sum of its proper divisors (1).

165749 is an equidigital number, since it uses as much as digits as its factorization.

165749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 165749 is about 407.1228315877. The cubic root of 165749 is about 54.9309325872.

The spelling of 165749 in words is "one hundred sixty-five thousand, seven hundred forty-nine".