145320321 has 8 divisors (see below), whose sum is σ = 193824864. Its totient is φ = 96848000.

The previous prime is 145320319. The next prime is 145320367. The reversal of 145320321 is 123023541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145320321 - 2¹ = 145320319 is a prime.

It is a super-2 number, since 2×145320321² = 42235991391086082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145320121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5950 + ... + 18056.

It is an arithmetic number, because the mean of its divisors is an integer number (24228108).

Almost surely, 2^145320321 is an apocalyptic number.

It is an amenable number.

145320321 is a deficient number, since it is larger than the sum of its proper divisors (48504543).

145320321 is a wasteful number, since it uses less digits than its factorization.

145320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16111.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 145320321 is about 12054.8878468445. The cubic root of 145320321 is about 525.7453612379.

Adding to 145320321 its reverse (123023541), we get a palindrome (268343862).

The spelling of 145320321 in words is "one hundred forty-five million, three hundred twenty thousand, three hundred twenty-one".