144201521 has 4 divisors (see below), whose sum is σ = 144230772. Its totient is φ = 144172272.

The previous prime is 144201503. The next prime is 144201587. The reversal of 144201521 is 125102441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125102441 = 19 ⋅6584339.

It can be written as a sum of positive squares in 2 ways, for example, as 118810000 + 25391521 = 10900^2 + 5039^2 .

It is a cyclic number.

It is not a de Polignac number, because 144201521 - 2⁶ = 144201457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 144201493 and 144201502.

It is not an unprimeable number, because it can be changed into a prime (144201121) 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, 5210 + ... + 17763.

It is an arithmetic number, because the mean of its divisors is an integer number (36057693).

Almost surely, 2^144201521 is an apocalyptic number.

It is an amenable number.

144201521 is a deficient number, since it is larger than the sum of its proper divisors (29251).

144201521 is an equidigital number, since it uses as much as digits as its factorization.

144201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29250.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 144201521 is about 12008.3937726908. The cubic root of 144201521 is about 524.3926715509.

Adding to 144201521 its reverse (125102441), we get a palindrome (269303962).

The spelling of 144201521 in words is "one hundred forty-four million, two hundred one thousand, five hundred twenty-one".