145339321 has 4 divisors (see below), whose sum is σ = 145372032. Its totient is φ = 145306612.

The previous prime is 145339309. The next prime is 145339339. The reversal of 145339321 is 123933541.

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 145339321 - 2⁵ = 145339289 is a prime.

It is a super-3 number, since 3×145339321³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145339021) 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, 8401 + ... + 19006.

It is an arithmetic number, because the mean of its divisors is an integer number (36343008).

Almost surely, 2^145339321 is an apocalyptic number.

It is an amenable number.

145339321 is a deficient number, since it is larger than the sum of its proper divisors (32711).

145339321 is an equidigital number, since it uses as much as digits as its factorization.

145339321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32710.

The product of its digits is 9720, while the sum is 31.

The square root of 145339321 is about 12055.6758831681. The cubic root of 145339321 is about 525.7682732126.

It can be divided in two parts, 14 and 5339321, that added together give a palindrome (5339335).

The spelling of 145339321 in words is "one hundred forty-five million, three hundred thirty-nine thousand, three hundred twenty-one".