144355621 has 2 divisors, whose sum is σ = 144355622. Its totient is φ = 144355620.

The previous prime is 144355583. The next prime is 144355643. The reversal of 144355621 is 126553441.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73290721 + 71064900 = 8561^2 + 8430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144355621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144395621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72177810 + 72177811.

It is an arithmetic number, because the mean of its divisors is an integer number (72177811).

Almost surely, 2^144355621 is an apocalyptic number.

It is an amenable number.

144355621 is a deficient number, since it is larger than the sum of its proper divisors (1).

144355621 is an equidigital number, since it uses as much as digits as its factorization.

144355621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The square root of 144355621 is about 12014.8084046313. The cubic root of 144355621 is about 524.5794013022.

The spelling of 144355621 in words is "one hundred forty-four million, three hundred fifty-five thousand, six hundred twenty-one".