165141321 has 4 divisors (see below), whose sum is σ = 220188432. Its totient is φ = 110094212.

The previous prime is 165141299. The next prime is 165141337. The reversal of 165141321 is 123141561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165141321 - 2⁹ = 165140809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165141291 and 165141300.

It is not an unprimeable number, because it can be changed into a prime (165141421) 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, 27523551 + ... + 27523556.

It is an arithmetic number, because the mean of its divisors is an integer number (55047108).

Almost surely, 2^165141321 is an apocalyptic number.

It is an amenable number.

165141321 is a deficient number, since it is larger than the sum of its proper divisors (55047111).

165141321 is an equidigital number, since it uses as much as digits as its factorization.

165141321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55047110.

The product of its digits is 720, while the sum is 24.

The square root of 165141321 is about 12850.7323137633. The cubic root of 165141321 is about 548.6372001237.

Adding to 165141321 its reverse (123141561), we get a palindrome (288282882).

The spelling of 165141321 in words is "one hundred sixty-five million, one hundred forty-one thousand, three hundred twenty-one".