143968861 has 2 divisors, whose sum is σ = 143968862. Its totient is φ = 143968860.

The previous prime is 143968841. The next prime is 143968897. The reversal of 143968861 is 168869341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138180025 + 5788836 = 11755^2 + 2406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143968861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143968841) 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, 71984430 + 71984431.

It is an arithmetic number, because the mean of its divisors is an integer number (71984431).

Almost surely, 2^143968861 is an apocalyptic number.

It is an amenable number.

143968861 is a deficient number, since it is larger than the sum of its proper divisors (1).

143968861 is an equidigital number, since it uses as much as digits as its factorization.

143968861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 143968861 is about 11998.7024715175. The cubic root of 143968861 is about 524.1104949764.

The spelling of 143968861 in words is "one hundred forty-three million, nine hundred sixty-eight thousand, eight hundred sixty-one".