145232321 has 16 divisors (see below), whose sum is σ = 159183360. Its totient is φ = 131698560.

The previous prime is 145232317. The next prime is 145232357. The reversal of 145232321 is 123232541.

It is a cyclic number.

It is not a de Polignac number, because 145232321 - 2² = 145232317 is a prime.

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 (145232221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302960 + ... + 303438.

It is an arithmetic number, because the mean of its divisors is an integer number (9948960).

Almost surely, 2^145232321 is an apocalyptic number.

It is an amenable number.

145232321 is a deficient number, since it is larger than the sum of its proper divisors (13951039).

145232321 is a wasteful number, since it uses less digits than its factorization.

145232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

The product of its digits is 1440, while the sum is 23.

The square root of 145232321 is about 12051.2373223665. The cubic root of 145232321 is about 525.6392165651.

Adding to 145232321 its reverse (123232541), we get a palindrome (268464862).

The spelling of 145232321 in words is "one hundred forty-five million, two hundred thirty-two thousand, three hundred twenty-one".