144424421 has 2 divisors, whose sum is σ = 144424422. Its totient is φ = 144424420.

The previous prime is 144424391. The next prime is 144424433. The reversal of 144424421 is 124424441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131928196 + 12496225 = 11486^2 + 3535^2 .

It is an emirp because it is prime and its reverse (124424441) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144424421 is a prime.

It is equal to p_8148113 and since 144424421 and 8148113 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 (144424451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72212210 + 72212211.

It is an arithmetic number, because the mean of its divisors is an integer number (72212211).

Almost surely, 2^144424421 is an apocalyptic number.

It is an amenable number.

144424421 is a deficient number, since it is larger than the sum of its proper divisors (1).

144424421 is an equidigital number, since it uses as much as digits as its factorization.

144424421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4096, while the sum is 26.

The square root of 144424421 is about 12017.6711970331. The cubic root of 144424421 is about 524.6627263814.

Adding to 144424421 its reverse (124424441), we get a palindrome (268848862).

The spelling of 144424421 in words is "one hundred forty-four million, four hundred twenty-four thousand, four hundred twenty-one".