144865621 has 2 divisors, whose sum is σ = 144865622. Its totient is φ = 144865620.

The previous prime is 144865603. The next prime is 144865639. The reversal of 144865621 is 126568441.

It is a balanced prime because it is at equal distance from previous prime (144865603) and next prime (144865639).

It can be written as a sum of positive squares in only one way, i.e., 114725521 + 30140100 = 10711^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 144865621 - 2⁷ = 144865493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144865681) 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, 72432810 + 72432811.

It is an arithmetic number, because the mean of its divisors is an integer number (72432811).

Almost surely, 2^144865621 is an apocalyptic number.

It is an amenable number.

144865621 is a deficient number, since it is larger than the sum of its proper divisors (1).

144865621 is an equidigital number, since it uses as much as digits as its factorization.

144865621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 37.

The square root of 144865621 is about 12036.0135011556. The cubic root of 144865621 is about 525.1964447013.

The spelling of 144865621 in words is "one hundred forty-four million, eight hundred sixty-five thousand, six hundred twenty-one".