143323981 has 2 divisors, whose sum is σ = 143323982. Its totient is φ = 143323980.

The previous prime is 143323963. The next prime is 143324029. The reversal of 143323981 is 189323341.

143323981 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., 142922025 + 401956 = 11955^2 + 634^2 .

It is an emirp because it is prime and its reverse (189323341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143323981 - 2¹¹ = 143321933 is a prime.

It is a super-2 number, since 2×143323981² = 41083527059376722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143323931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71661990 + 71661991.

It is an arithmetic number, because the mean of its divisors is an integer number (71661991).

Almost surely, 2^143323981 is an apocalyptic number.

It is an amenable number.

143323981 is a deficient number, since it is larger than the sum of its proper divisors (1).

143323981 is an equidigital number, since it uses as much as digits as its factorization.

143323981 is an evil number, because the sum of its binary digits is even.

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

The square root of 143323981 is about 11971.7994052690. The cubic root of 143323981 is about 523.3267739136.

The spelling of 143323981 in words is "one hundred forty-three million, three hundred twenty-three thousand, nine hundred eighty-one".