144572721 has 4 divisors (see below), whose sum is σ = 192763632. Its totient is φ = 96381812.

The previous prime is 144572719. The next prime is 144572731. The reversal of 144572721 is 127275441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127275441 = 3 ⋅42425147.

It is a cyclic number.

It is not a de Polignac number, because 144572721 - 2¹ = 144572719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144572731) 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, 24095451 + ... + 24095456.

It is an arithmetic number, because the mean of its divisors is an integer number (48190908).

Almost surely, 2^144572721 is an apocalyptic number.

It is an amenable number.

144572721 is a deficient number, since it is larger than the sum of its proper divisors (48190911).

144572721 is an equidigital number, since it uses as much as digits as its factorization.

144572721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48190910.

The product of its digits is 15680, while the sum is 33.

The square root of 144572721 is about 12023.8396945402. The cubic root of 144572721 is about 524.8422455725.

The spelling of 144572721 in words is "one hundred forty-four million, five hundred seventy-two thousand, seven hundred twenty-one".