165320539 has 4 divisors (see below), whose sum is σ = 174021640. Its totient is φ = 156619440.

The previous prime is 165320483. The next prime is 165320543. The reversal of 165320539 is 935023561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935023561 = 953 ⋅981137.

It is a cyclic number.

It is not a de Polignac number, because 165320539 - 2⁷ = 165320411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165320579) 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, 4350522 + ... + 4350559.

It is an arithmetic number, because the mean of its divisors is an integer number (43505410).

Almost surely, 2^165320539 is an apocalyptic number.

165320539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

165320539 is a deficient number, since it is larger than the sum of its proper divisors (8701101).

165320539 is an equidigital number, since it uses as much as digits as its factorization.

165320539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8701100.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 165320539 is about 12857.7034885706. The cubic root of 165320539 is about 548.8355960866.

The spelling of 165320539 in words is "one hundred sixty-five million, three hundred twenty thousand, five hundred thirty-nine".