143218393 has 2 divisors, whose sum is σ = 143218394. Its totient is φ = 143218392.

The previous prime is 143218373. The next prime is 143218399. The reversal of 143218393 is 393812341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121947849 + 21270544 = 11043^2 + 4612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143218393 is a prime.

It is a super-3 number, since 3×143218393³ (a number of 25 digits) contains 333 as substring.

It is equal to p_8083663 and since 143218393 and 8083663 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (143218399) 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, 71609196 + 71609197.

It is an arithmetic number, because the mean of its divisors is an integer number (71609197).

Almost surely, 2^143218393 is an apocalyptic number.

It is an amenable number.

143218393 is a deficient number, since it is larger than the sum of its proper divisors (1).

143218393 is an equidigital number, since it uses as much as digits as its factorization.

143218393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 143218393 is about 11967.3887293762. The cubic root of 143218393 is about 523.1982292415.

The spelling of 143218393 in words is "one hundred forty-three million, two hundred eighteen thousand, three hundred ninety-three".