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165513 = 355171

165513 has 4 divisors (see below), whose sum is σ = 220688. Its totient is φ = 110340.

The previous prime is 165511. The next prime is 165523. The reversal of 165513 is 315561.

It is a happy number.

165513 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 165513 - 21 = 165511 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

165513 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 165513.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 165513.

It is not an unprimeable number, because it can be changed into a prime (165511) 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, 27583 + ... + 27588.

It is an arithmetic number, because the mean of its divisors is an integer number (55172).

2165513 is an apocalyptic number.

It is an amenable number.

165513 is a deficient number, since it is larger than the sum of its proper divisors (55175).

165513 is an equidigital number, since it uses as much as digits as its factorization.

165513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55174.

The product of its digits is 450, while the sum is 21.

The square root of 165513 is about 406.8328895259. The cubic root of 165513 is about 54.9048492570.

The spelling of 165513 in words is "one hundred sixty-five thousand, five hundred thirteen".

Divisors: 1 3 55171 165513