165831329 has 4 divisors (see below), whose sum is σ = 168960276. Its totient is φ = 162702384.

The previous prime is 165831319. The next prime is 165831343. The reversal of 165831329 is 923138561.

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: 923138561 = 709 ⋅1302029.

It can be written as a sum of positive squares in 2 ways, for example, as 49730704 + 116100625 = 7052^2 + 10775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165831329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165831292 and 165831301.

It is not an unprimeable number, because it can be changed into a prime (165831319) 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, 1564394 + ... + 1564499.

It is an arithmetic number, because the mean of its divisors is an integer number (42240069).

Almost surely, 2^165831329 is an apocalyptic number.

It is an amenable number.

165831329 is a deficient number, since it is larger than the sum of its proper divisors (3128947).

165831329 is an equidigital number, since it uses as much as digits as its factorization.

165831329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128946.

The product of its digits is 38880, while the sum is 38.

The square root of 165831329 is about 12877.5513588570. The cubic root of 165831329 is about 549.4002597575.

The spelling of 165831329 in words is "one hundred sixty-five million, eight hundred thirty-one thousand, three hundred twenty-nine".