144619721 has 2 divisors, whose sum is σ = 144619722. Its totient is φ = 144619720.

The previous prime is 144619639. The next prime is 144619729. The reversal of 144619721 is 127916441.

144619721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143736121 + 883600 = 11989^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 144619721 - 2¹⁰ = 144618697 is a prime.

It is a Chen prime.

It is equal to p_8158445 and since 144619721 and 8158445 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (144619729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72309860 + 72309861.

It is an arithmetic number, because the mean of its divisors is an integer number (72309861).

Almost surely, 2^144619721 is an apocalyptic number.

It is an amenable number.

144619721 is a deficient number, since it is larger than the sum of its proper divisors (1).

144619721 is an equidigital number, since it uses as much as digits as its factorization.

144619721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 144619721 is about 12025.7939862614. The cubic root of 144619721 is about 524.8991140991.

The spelling of 144619721 in words is "one hundred forty-four million, six hundred nineteen thousand, seven hundred twenty-one".