144641821 has 8 divisors (see below), whose sum is σ = 151313400. Its totient is φ = 138082560.

The previous prime is 144641803. The next prime is 144641837. The reversal of 144641821 is 128146441.

It can be written as a sum of positive squares in 4 ways, for example, as 19448100 + 125193721 = 4410^2 + 11189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144641821 - 2¹⁷ = 144510749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144641881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25440 + ... + 30601.

It is an arithmetic number, because the mean of its divisors is an integer number (18914175).

Almost surely, 2^144641821 is an apocalyptic number.

It is an amenable number.

144641821 is a deficient number, since it is larger than the sum of its proper divisors (6671579).

144641821 is an equidigital number, since it uses as much as digits as its factorization.

144641821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56159.

The product of its digits is 6144, while the sum is 31.

The square root of 144641821 is about 12026.7128094089. The cubic root of 144641821 is about 524.9258501475.

The spelling of 144641821 in words is "one hundred forty-four million, six hundred forty-one thousand, eight hundred twenty-one".