145424321 has 16 divisors (see below), whose sum is σ = 169881600. Its totient is φ = 121909968.

The previous prime is 145424263. The next prime is 145424327. The reversal of 145424321 is 123424541.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145424321 is a prime.

It is a super-3 number, since 3×145424321³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (145424327) 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, 91310 + ... + 92888.

It is an arithmetic number, because the mean of its divisors is an integer number (10617600).

Almost surely, 2^145424321 is an apocalyptic number.

It is an amenable number.

145424321 is a deficient number, since it is larger than the sum of its proper divisors (24457279).

145424321 is a wasteful number, since it uses less digits than its factorization.

145424321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868.

The product of its digits is 3840, while the sum is 26.

The square root of 145424321 is about 12059.2006783203. The cubic root of 145424321 is about 525.8707497104.

Adding to 145424321 its reverse (123424541), we get a palindrome (268848862).

The spelling of 145424321 in words is "one hundred forty-five million, four hundred twenty-four thousand, three hundred twenty-one".