144291781 has 2 divisors, whose sum is σ = 144291782. Its totient is φ = 144291780.

The previous prime is 144291677. The next prime is 144291787. The reversal of 144291781 is 187192441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87590881 + 56700900 = 9359^2 + 7530^2 .

It is a cyclic number.

It is not a de Polignac number, because 144291781 - 2¹⁹ = 143767493 is a prime.

It is a super-2 number, since 2×144291781² = 41640236128303922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 144291781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144291787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72145890 + 72145891.

It is an arithmetic number, because the mean of its divisors is an integer number (72145891).

Almost surely, 2^144291781 is an apocalyptic number.

It is an amenable number.

144291781 is a deficient number, since it is larger than the sum of its proper divisors (1).

144291781 is an equidigital number, since it uses as much as digits as its factorization.

144291781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 144291781 is about 12012.1513893224. The cubic root of 144291781 is about 524.5020596956.

The spelling of 144291781 in words is "one hundred forty-four million, two hundred ninety-one thousand, seven hundred eighty-one".