165394319 has 4 divisors (see below), whose sum is σ = 166447944. Its totient is φ = 164340696.

The previous prime is 165394303. The next prime is 165394367. The reversal of 165394319 is 913493561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 913493561 = 107 ⋅8537323.

It is a cyclic number.

It is not a de Polignac number, because 165394319 - 2⁴ = 165394303 is a prime.

It is a super-2 number, since 2×165394319² = 54710561514947522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165394379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526577 + ... + 526890.

It is an arithmetic number, because the mean of its divisors is an integer number (41611986).

Almost surely, 2^165394319 is an apocalyptic number.

165394319 is a deficient number, since it is larger than the sum of its proper divisors (1053625).

165394319 is a wasteful number, since it uses less digits than its factorization.

165394319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053624.

The product of its digits is 87480, while the sum is 41.

The square root of 165394319 is about 12860.5722656498. The cubic root of 165394319 is about 548.9172295569.

The spelling of 165394319 in words is "one hundred sixty-five million, three hundred ninety-four thousand, three hundred nineteen".