144085621 has 4 divisors (see below), whose sum is σ = 144136044. Its totient is φ = 144035200.

The previous prime is 144085619. The next prime is 144085637. The reversal of 144085621 is 126580441.

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 136632721 + 7452900 = 11689^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 144085621 - 2¹ = 144085619 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144085681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20650 + ... + 26731.

It is an arithmetic number, because the mean of its divisors is an integer number (36034011).

Almost surely, 2^144085621 is an apocalyptic number.

It is an amenable number.

144085621 is a deficient number, since it is larger than the sum of its proper divisors (50423).

144085621 is an equidigital number, since it uses as much as digits as its factorization.

144085621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50422.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 144085621 is about 12003.5670115179. The cubic root of 144085621 is about 524.2521427492.

The spelling of 144085621 in words is "one hundred forty-four million, eighty-five thousand, six hundred twenty-one".