144879221 has 4 divisors (see below), whose sum is σ = 146161452. Its totient is φ = 143596992.

The previous prime is 144879197. The next prime is 144879223. The reversal of 144879221 is 122978441.

It is a happy number.

144879221 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.

It can be written as a sum of positive squares in 2 ways, for example, as 23571025 + 121308196 = 4855^2 + 11014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144879221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144879223) 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, 640946 + ... + 641171.

It is an arithmetic number, because the mean of its divisors is an integer number (36540363).

Almost surely, 2^144879221 is an apocalyptic number.

It is an amenable number.

144879221 is a deficient number, since it is larger than the sum of its proper divisors (1282231).

144879221 is a wasteful number, since it uses less digits than its factorization.

144879221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282230.

The product of its digits is 32256, while the sum is 38.

The square root of 144879221 is about 12036.5784590140. The cubic root of 144879221 is about 525.2128793531.

The spelling of 144879221 in words is "one hundred forty-four million, eight hundred seventy-nine thousand, two hundred twenty-one".