145023321 has 4 divisors (see below), whose sum is σ = 193364432. Its totient is φ = 96682212.

The previous prime is 145023293. The next prime is 145023337. The reversal of 145023321 is 123320541.

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 not a de Polignac number, because 145023321 - 2⁵ = 145023289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145023421) 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, 24170551 + ... + 24170556.

It is an arithmetic number, because the mean of its divisors is an integer number (48341108).

Almost surely, 2^145023321 is an apocalyptic number.

It is an amenable number.

145023321 is a deficient number, since it is larger than the sum of its proper divisors (48341111).

145023321 is an equidigital number, since it uses as much as digits as its factorization.

145023321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48341110.

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

The square root of 145023321 is about 12042.5628916772. The cubic root of 145023321 is about 525.3869510090.

Adding to 145023321 its reverse (123320541), we get a palindrome (268343862).

The spelling of 145023321 in words is "one hundred forty-five million, twenty-three thousand, three hundred twenty-one".