144637421 has 2 divisors, whose sum is σ = 144637422. Its totient is φ = 144637420.

The previous prime is 144637417. The next prime is 144637433. The reversal of 144637421 is 124736441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131928196 + 12709225 = 11486^2 + 3565^2 .

It is an emirp because it is prime and its reverse (124736441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 144637421 - 2² = 144637417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144637021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72318710 + 72318711.

It is an arithmetic number, because the mean of its divisors is an integer number (72318711).

Almost surely, 2^144637421 is an apocalyptic number.

It is an amenable number.

144637421 is a deficient number, since it is larger than the sum of its proper divisors (1).

144637421 is an equidigital number, since it uses as much as digits as its factorization.

144637421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

The square root of 144637421 is about 12026.5298818903. The cubic root of 144637421 is about 524.9205273505.

The spelling of 144637421 in words is "one hundred forty-four million, six hundred thirty-seven thousand, four hundred twenty-one".