144821581 has 2 divisors, whose sum is σ = 144821582. Its totient is φ = 144821580.

The previous prime is 144821569. The next prime is 144821609. The reversal of 144821581 is 185128441.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128459556 + 16362025 = 11334^2 + 4045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144821581 is a prime.

It is a super-2 number, since 2×144821581² = 41946580646679122, which contains 22 as substring.

It is equal to p_8169154 and since 144821581 and 8169154 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144821681) 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, 72410790 + 72410791.

It is an arithmetic number, because the mean of its divisors is an integer number (72410791).

Almost surely, 2^144821581 is an apocalyptic number.

It is an amenable number.

144821581 is a deficient number, since it is larger than the sum of its proper divisors (1).

144821581 is an equidigital number, since it uses as much as digits as its factorization.

144821581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10240, while the sum is 34.

The square root of 144821581 is about 12034.1838526757. The cubic root of 144821581 is about 525.1432183721.

The spelling of 144821581 in words is "one hundred forty-four million, eight hundred twenty-one thousand, five hundred eighty-one".