144721 has 4 divisors (see below), whose sum is σ = 153252. Its totient is φ = 136192.

The previous prime is 144719. The next prime is 144731. The reversal of 144721 is 127441.

144721 = 48² + 49² + ... + 81².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127441 = 31 ⋅4111.

It can be written as a sum of positive squares in 2 ways, for example, as 130321 + 14400 = 361^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 144721 - 2¹ = 144719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144701) 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, 4240 + ... + 4273.

It is an arithmetic number, because the mean of its divisors is an integer number (38313).

2¹⁴⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

144721 is a deficient number, since it is larger than the sum of its proper divisors (8531).

144721 is an equidigital number, since it uses as much as digits as its factorization.

144721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8530.

The product of its digits is 224, while the sum is 19.

The square root of 144721 is about 380.4221339512. The cubic root of 144721 is about 52.5021616646.

The spelling of 144721 in words is "one hundred forty-four thousand, seven hundred twenty-one", and thus it is an iban number.