144478781 has 2 divisors, whose sum is σ = 144478782. Its totient is φ = 144478780.

The previous prime is 144478769. The next prime is 144478811. The reversal of 144478781 is 187874441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116748025 + 27730756 = 10805^2 + 5266^2 .

It is a cyclic number.

It is not a de Polignac number, because 144478781 - 2¹⁰ = 144477757 is a prime.

It is a super-2 number, since 2×144478781² = 41748236318491922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144478181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72239390 + 72239391.

It is an arithmetic number, because the mean of its divisors is an integer number (72239391).

Almost surely, 2^144478781 is an apocalyptic number.

It is an amenable number.

144478781 is a deficient number, since it is larger than the sum of its proper divisors (1).

144478781 is an equidigital number, since it uses as much as digits as its factorization.

144478781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200704, while the sum is 44.

The square root of 144478781 is about 12019.9326537215. The cubic root of 144478781 is about 524.7285441705.

The spelling of 144478781 in words is "one hundred forty-four million, four hundred seventy-eight thousand, seven hundred eighty-one".