145230321 has 4 divisors (see below), whose sum is σ = 193640432. Its totient is φ = 96820212.

The previous prime is 145230317. The next prime is 145230331. The reversal of 145230321 is 123032541.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123032541 = 3 ⋅41010847.

It is not a de Polignac number, because 145230321 - 2² = 145230317 is a prime.

It is a super-2 number, since 2×145230321² = 42183692275526082, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145230331) 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 3 ways as a sum of consecutive naturals, for example, 24205051 + ... + 24205056.

It is an arithmetic number, because the mean of its divisors is an integer number (48410108).

Almost surely, 2^145230321 is an apocalyptic number.

It is an amenable number.

145230321 is a deficient number, since it is larger than the sum of its proper divisors (48410111).

145230321 is an equidigital number, since it uses as much as digits as its factorization.

145230321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48410110.

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

The square root of 145230321 is about 12051.1543430495. The cubic root of 145230321 is about 525.6368036879.

Adding to 145230321 its reverse (123032541), we get a palindrome (268262862).

The spelling of 145230321 in words is "one hundred forty-five million, two hundred thirty thousand, three hundred twenty-one".