165985229 has 4 divisors (see below), whose sum is σ = 175749084. Its totient is φ = 156221376.

The previous prime is 165985217. The next prime is 165985277. The reversal of 165985229 is 922589561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 922589561 = 37 ⋅24934853.

It can be written as a sum of positive squares in 2 ways, for example, as 133518025 + 32467204 = 11555^2 + 5698^2 .

It is a cyclic number.

It is not a de Polignac number, because 165985229 - 2⁴ = 165985213 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 (165985279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4881902 + ... + 4881935.

It is an arithmetic number, because the mean of its divisors is an integer number (43937271).

Almost surely, 2^165985229 is an apocalyptic number.

It is an amenable number.

165985229 is a deficient number, since it is larger than the sum of its proper divisors (9763855).

165985229 is an equidigital number, since it uses as much as digits as its factorization.

165985229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9763854.

The product of its digits is 388800, while the sum is 47.

The square root of 165985229 is about 12883.5254880021. The cubic root of 165985229 is about 549.5701644382.

The spelling of 165985229 in words is "one hundred sixty-five million, nine hundred eighty-five thousand, two hundred twenty-nine".