144220513 has 4 divisors (see below), whose sum is σ = 144446148. Its totient is φ = 143994880.

The previous prime is 144220501. The next prime is 144220519. The reversal of 144220513 is 315022441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315022441 = 449 ⋅701609.

It can be written as a sum of positive squares in 2 ways, for example, as 134838544 + 9381969 = 11612^2 + 3063^2 .

It is a cyclic number.

It is not a de Polignac number, because 144220513 - 2²¹ = 142123361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144220519) 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, 111856 + ... + 113137.

It is an arithmetic number, because the mean of its divisors is an integer number (36111537).

Almost surely, 2^144220513 is an apocalyptic number.

It is an amenable number.

144220513 is a deficient number, since it is larger than the sum of its proper divisors (225635).

144220513 is an equidigital number, since it uses as much as digits as its factorization.

144220513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225634.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 144220513 is about 12009.1845268528. The cubic root of 144220513 is about 524.4156921782.

Adding to 144220513 its reverse (315022441), we get a palindrome (459242954).

The spelling of 144220513 in words is "one hundred forty-four million, two hundred twenty thousand, five hundred thirteen".