144561521 has 8 divisors (see below), whose sum is σ = 158234664. Its totient is φ = 131253120.

The previous prime is 144561503. The next prime is 144561539. The reversal of 144561521 is 125165441.

It is an interprime number because it is at equal distance from previous prime (144561503) and next prime (144561539).

It can be written as a sum of positive squares in 4 ways, for example, as 2689600 + 141871921 = 1640^2 + 11911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144561521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144561551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90356 + ... + 91941.

It is an arithmetic number, because the mean of its divisors is an integer number (19779333).

Almost surely, 2^144561521 is an apocalyptic number.

It is an amenable number.

144561521 is a deficient number, since it is larger than the sum of its proper divisors (13673143).

144561521 is a wasteful number, since it uses less digits than its factorization.

144561521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182371.

The product of its digits is 4800, while the sum is 29.

The square root of 144561521 is about 12023.3739441140. The cubic root of 144561521 is about 524.8286921052.

The spelling of 144561521 in words is "one hundred forty-four million, five hundred sixty-one thousand, five hundred twenty-one".