165257 has 4 divisors (see below), whose sum is σ = 174996. Its totient is φ = 155520.
The previous prime is 165247. The next prime is 165287. The reversal of 165257 is 752561.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752561 = 83 ⋅9067.
It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 109561 = 236^2 + 331^2 .
It is a cyclic number.
It is not a de Polignac number, because 165257 - 28 = 165001 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 14.
It is not an unprimeable number, because it can be changed into a prime (165247) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4844 + ... + 4877.
It is an arithmetic number, because the mean of its divisors is an integer number (43749).
2165257 is an apocalyptic number.
165257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.
It is an amenable number.
165257 is a deficient number, since it is larger than the sum of its proper divisors (9739).
165257 is an equidigital number, since it uses as much as digits as its factorization.
165257 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9738.
The product of its digits is 2100, while the sum is 26.
The square root of 165257 is about 406.5181422766. The cubic root of 165257 is about 54.8765274247.
The spelling of 165257 in words is "one hundred sixty-five thousand, two hundred fifty-seven".
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