144155221 has 16 divisors (see below), whose sum is σ = 172706688. Its totient is φ = 117734400.

The previous prime is 144155213. The next prime is 144155243. The reversal of 144155221 is 122551441.

It is not a de Polignac number, because 144155221 - 2³ = 144155213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144155281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6501 + ... + 18181.

It is an arithmetic number, because the mean of its divisors is an integer number (10794168).

Almost surely, 2^144155221 is an apocalyptic number.

It is an amenable number.

144155221 is a deficient number, since it is larger than the sum of its proper divisors (28551467).

144155221 is a wasteful number, since it uses less digits than its factorization.

144155221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11772.

The product of its digits is 1600, while the sum is 25.

The square root of 144155221 is about 12006.4657997264. The cubic root of 144155221 is about 524.3365418154.

The spelling of 144155221 in words is "one hundred forty-four million, one hundred fifty-five thousand, two hundred twenty-one".