144572821 has 2 divisors, whose sum is σ = 144572822. Its totient is φ = 144572820.

The previous prime is 144572819. The next prime is 144572839. The reversal of 144572821 is 128275441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129276900 + 15295921 = 11370^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 144572821 - 2¹ = 144572819 is a prime.

Together with 144572819, it forms a pair of twin primes.

It is equal to p_8155915 and since 144572821 and 8155915 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 (144572861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72286410 + 72286411.

It is an arithmetic number, because the mean of its divisors is an integer number (72286411).

Almost surely, 2^144572821 is an apocalyptic number.

It is an amenable number.

144572821 is a deficient number, since it is larger than the sum of its proper divisors (1).

144572821 is an equidigital number, since it uses as much as digits as its factorization.

144572821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 34.

The square root of 144572821 is about 12023.8438529449. The cubic root of 144572821 is about 524.8423665824.

The spelling of 144572821 in words is "one hundred forty-four million, five hundred seventy-two thousand, eight hundred twenty-one".