144446821 has 2 divisors, whose sum is σ = 144446822. Its totient is φ = 144446820.

The previous prime is 144446803. The next prime is 144446843. The reversal of 144446821 is 128644441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140161921 + 4284900 = 11839^2 + 2070^2 .

It is an emirp because it is prime and its reverse (128644441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 144446821 - 2¹³ = 144438629 is a prime.

It is equal to p_8149309 and since 144446821 and 8149309 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144446801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72223410 + 72223411.

It is an arithmetic number, because the mean of its divisors is an integer number (72223411).

Almost surely, 2^144446821 is an apocalyptic number.

It is an amenable number.

144446821 is a deficient number, since it is larger than the sum of its proper divisors (1).

144446821 is an equidigital number, since it uses as much as digits as its factorization.

144446821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 34.

The square root of 144446821 is about 12018.6031218274. The cubic root of 144446821 is about 524.6898497664.

The spelling of 144446821 in words is "one hundred forty-four million, four hundred forty-six thousand, eight hundred twenty-one".