165417539 has 4 divisors (see below), whose sum is σ = 189048624. Its totient is φ = 141786456.

The previous prime is 165417521. The next prime is 165417569. The reversal of 165417539 is 935714561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935714561 = 17 ⋅55042033.

It is a de Polignac number, because none of the positive numbers 2^k-165417539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165417496 and 165417505.

It is not an unprimeable number, because it can be changed into a prime (165417509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11815532 + ... + 11815545.

It is an arithmetic number, because the mean of its divisors is an integer number (47262156).

Almost surely, 2^165417539 is an apocalyptic number.

165417539 is a deficient number, since it is larger than the sum of its proper divisors (23631085).

165417539 is an equidigital number, since it uses as much as digits as its factorization.

165417539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23631084.

The product of its digits is 113400, while the sum is 41.

The square root of 165417539 is about 12861.4749931724. The cubic root of 165417539 is about 548.9429161741.

The spelling of 165417539 in words is "one hundred sixty-five million, four hundred seventeen thousand, five hundred thirty-nine".