144553621 has 2 divisors, whose sum is σ = 144553622. Its totient is φ = 144553620.

The previous prime is 144553613. The next prime is 144553637. The reversal of 144553621 is 126355441.

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., 89586225 + 54967396 = 9465^2 + 7414^2 .

It is a cyclic number.

It is not a de Polignac number, because 144553621 - 2³ = 144553613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144553681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72276810 + 72276811.

It is an arithmetic number, because the mean of its divisors is an integer number (72276811).

Almost surely, 2^144553621 is an apocalyptic number.

It is an amenable number.

144553621 is a deficient number, since it is larger than the sum of its proper divisors (1).

144553621 is an equidigital number, since it uses as much as digits as its factorization.

144553621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 144553621 is about 12023.0454128727. The cubic root of 144553621 is about 524.8191316491.

The spelling of 144553621 in words is "one hundred forty-four million, five hundred fifty-three thousand, six hundred twenty-one".