143681789 has 2 divisors, whose sum is σ = 143681790. Its totient is φ = 143681788.

The previous prime is 143681771. The next prime is 143681849. The reversal of 143681789 is 987186341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140825689 + 2856100 = 11867^2 + 1690^2 .

It is an emirp because it is prime and its reverse (987186341) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143681789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143681719) 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, 71840894 + 71840895.

It is an arithmetic number, because the mean of its divisors is an integer number (71840895).

Almost surely, 2^143681789 is an apocalyptic number.

It is an amenable number.

143681789 is a deficient number, since it is larger than the sum of its proper divisors (1).

143681789 is an equidigital number, since it uses as much as digits as its factorization.

143681789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 143681789 is about 11986.7338754141. The cubic root of 143681789 is about 523.7619067208.

The spelling of 143681789 in words is "one hundred forty-three million, six hundred eighty-one thousand, seven hundred eighty-nine".