144085681 has 2 divisors, whose sum is σ = 144085682. Its totient is φ = 144085680.

The previous prime is 144085673. The next prime is 144085687. The reversal of 144085681 is 186580441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134351281 + 9734400 = 11591^2 + 3120^2 .

It is an emirp because it is prime and its reverse (186580441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 144085681 - 2³ = 144085673 is a prime.

It is a super-2 number, since 2×144085681² = 41521366938467522, 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 144085681.

It is not a weakly prime, because it can be changed into another prime (144085687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72042840 + 72042841.

It is an arithmetic number, because the mean of its divisors is an integer number (72042841).

Almost surely, 2^144085681 is an apocalyptic number.

It is an amenable number.

144085681 is a deficient number, since it is larger than the sum of its proper divisors (1).

144085681 is an equidigital number, since it uses as much as digits as its factorization.

144085681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 144085681 is about 12003.5695107747. The cubic root of 144085681 is about 524.2522155188.

The spelling of 144085681 in words is "one hundred forty-four million, eighty-five thousand, six hundred eighty-one".