165551 has 2 divisors, whose sum is σ = 165552. Its totient is φ = 165550.
The previous prime is 165541. The next prime is 165553. The reversal of 165551 is 155561.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-165551 is a prime.
Together with 165553, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (165553) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82775 + 82776.
It is an arithmetic number, because the mean of its divisors is an integer number (82776).
2165551 is an apocalyptic number.
165551 is a deficient number, since it is larger than the sum of its proper divisors (1).
165551 is an equidigital number, since it uses as much as digits as its factorization.
165551 is an evil number, because the sum of its binary digits is even.
The product of its digits is 750, while the sum is 23.
The square root of 165551 is about 406.8795890678. The cubic root of 165551 is about 54.9090507892.
The spelling of 165551 in words is "one hundred sixty-five thousand, five hundred fifty-one".
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