144180781 has 2 divisors, whose sum is σ = 144180782. Its totient is φ = 144180780.

The previous prime is 144180769. The next prime is 144180787. The reversal of 144180781 is 187081441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128459556 + 15721225 = 11334^2 + 3965^2 .

It is an emirp because it is prime and its reverse (187081441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 144180781 - 2⁷ = 144180653 is a prime.

It is a super-2 number, since 2×144180781² = 41576195219539922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144180787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72090390 + 72090391.

It is an arithmetic number, because the mean of its divisors is an integer number (72090391).

Almost surely, 2^144180781 is an apocalyptic number.

It is an amenable number.

144180781 is a deficient number, since it is larger than the sum of its proper divisors (1).

144180781 is an equidigital number, since it uses as much as digits as its factorization.

144180781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 144180781 is about 12007.5301790168. The cubic root of 144180781 is about 524.3675298247.

The spelling of 144180781 in words is "one hundred forty-four million, one hundred eighty thousand, seven hundred eighty-one".