144730521 has 12 divisors (see below), whose sum is σ = 225136548. Its totient is φ = 89064864.

The previous prime is 144730517. The next prime is 144730541. The reversal of 144730521 is 125037441.

It can be written as a sum of positive squares in 2 ways, for example, as 55711296 + 89019225 = 7464^2 + 9435^2 .

It is not a de Polignac number, because 144730521 - 2² = 144730517 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (144730541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 618390 + ... + 618623.

It is an arithmetic number, because the mean of its divisors is an integer number (18761379).

Almost surely, 2^144730521 is an apocalyptic number.

It is an amenable number.

144730521 is a deficient number, since it is larger than the sum of its proper divisors (80406027).

144730521 is a wasteful number, since it uses less digits than its factorization.

144730521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237032 (or 1237029 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 144730521 is about 12030.3998686660. The cubic root of 144730521 is about 525.0331298821.

Adding to 144730521 its reverse (125037441), we get a palindrome (269767962).

The spelling of 144730521 in words is "one hundred forty-four million, seven hundred thirty thousand, five hundred twenty-one".