143535221 has 2 divisors, whose sum is σ = 143535222. Its totient is φ = 143535220.

The previous prime is 143535187. The next prime is 143535229. The reversal of 143535221 is 122535341.

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., 101103025 + 42432196 = 10055^2 + 6514^2 .

It is an emirp because it is prime and its reverse (122535341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143535221 - 2¹⁸ = 143273077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143535229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71767610 + 71767611.

It is an arithmetic number, because the mean of its divisors is an integer number (71767611).

Almost surely, 2^143535221 is an apocalyptic number.

It is an amenable number.

143535221 is a deficient number, since it is larger than the sum of its proper divisors (1).

143535221 is an equidigital number, since it uses as much as digits as its factorization.

143535221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 26.

The square root of 143535221 is about 11980.6185566522. The cubic root of 143535221 is about 523.5837518008.

The spelling of 143535221 in words is "one hundred forty-three million, five hundred thirty-five thousand, two hundred twenty-one".