144545221 has 4 divisors (see below), whose sum is σ = 146995200. Its totient is φ = 142095244.

The previous prime is 144545209. The next prime is 144545239. The reversal of 144545221 is 122545441.

144545221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144545221 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 144545221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144545021) 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, 1224901 + ... + 1225018.

It is an arithmetic number, because the mean of its divisors is an integer number (36748800).

Almost surely, 2^144545221 is an apocalyptic number.

It is an amenable number.

144545221 is a deficient number, since it is larger than the sum of its proper divisors (2449979).

144545221 is an equidigital number, since it uses as much as digits as its factorization.

144545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449978.

The product of its digits is 6400, while the sum is 28.

The square root of 144545221 is about 12022.6960786672. The cubic root of 144545221 is about 524.8089657188.

The spelling of 144545221 in words is "one hundred forty-four million, five hundred forty-five thousand, two hundred twenty-one".