145001321 has 4 divisors (see below), whose sum is σ = 145054932. Its totient is φ = 144947712.

The previous prime is 145001317. The next prime is 145001341. The reversal of 145001321 is 123100541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123100541 = 659 ⋅186799.

It can be written as a sum of positive squares in 2 ways, for example, as 117961321 + 27040000 = 10861^2 + 5200^2 .

It is a cyclic number.

It is not a de Polignac number, because 145001321 - 2² = 145001317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145001321.

It is not an unprimeable number, because it can be changed into a prime (145001341) 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, 22520 + ... + 28233.

It is an arithmetic number, because the mean of its divisors is an integer number (36263733).

Almost surely, 2^145001321 is an apocalyptic number.

It is an amenable number.

145001321 is a deficient number, since it is larger than the sum of its proper divisors (53611).

145001321 is an equidigital number, since it uses as much as digits as its factorization.

145001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53610.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 145001321 is about 12041.6494302068. The cubic root of 145001321 is about 525.3603826443.

Adding to 145001321 its reverse (123100541), we get a palindrome (268101862).

The spelling of 145001321 in words is "one hundred forty-five million, one thousand, three hundred twenty-one".