144531721 has 8 divisors (see below), whose sum is σ = 147778560. Its totient is φ = 141292128.

The previous prime is 144531713. The next prime is 144531733. The reversal of 144531721 is 127135441.

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

It is a cyclic number.

It is not a de Polignac number, because 144531721 - 2³ = 144531713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144531721.

It is not an unprimeable number, because it can be changed into a prime (144531791) 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 7 ways as a sum of consecutive naturals, for example, 66565 + ... + 68701.

It is an arithmetic number, because the mean of its divisors is an integer number (18472320).

Almost surely, 2^144531721 is an apocalyptic number.

It is an amenable number.

144531721 is a deficient number, since it is larger than the sum of its proper divisors (3246839).

144531721 is a wasteful number, since it uses less digits than its factorization.

144531721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623.

The product of its digits is 3360, while the sum is 28.

The square root of 144531721 is about 12022.1346274279. The cubic root of 144531721 is about 524.7926267914.

The spelling of 144531721 in words is "one hundred forty-four million, five hundred thirty-one thousand, seven hundred twenty-one".