143516221 has 2 divisors, whose sum is σ = 143516222. Its totient is φ = 143516220.

The previous prime is 143516201. The next prime is 143516257. The reversal of 143516221 is 122615341.

It is a happy number.

143516221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 5712100 = 11739^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 143516221 - 2¹⁷ = 143385149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143516201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71758110 + 71758111.

It is an arithmetic number, because the mean of its divisors is an integer number (71758111).

Almost surely, 2^143516221 is an apocalyptic number.

It is an amenable number.

143516221 is a deficient number, since it is larger than the sum of its proper divisors (1).

143516221 is an equidigital number, since it uses as much as digits as its factorization.

143516221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 143516221 is about 11979.8255830375. The cubic root of 143516221 is about 523.5606482257.

The spelling of 143516221 in words is "one hundred forty-three million, five hundred sixteen thousand, two hundred twenty-one".