143981 has 2 divisors, whose sum is σ = 143982. Its totient is φ = 143980.

The previous prime is 143977. The next prime is 143999. The reversal of 143981 is 189341.

143981 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., 126025 + 17956 = 355^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 143981 - 2² = 143977 is a prime.

It is a super-2 number, since 2×143981² = 41461056722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 143981.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 143981.

It is not a weakly prime, because it can be changed into another prime (143971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71990 + 71991.

It is an arithmetic number, because the mean of its divisors is an integer number (71991).

2¹⁴³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

143981 is a deficient number, since it is larger than the sum of its proper divisors (1).

143981 is an equidigital number, since it uses as much as digits as its factorization.

143981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 143981 is about 379.4482836962. The cubic root of 143981 is about 52.4125225010.

The spelling of 143981 in words is "one hundred forty-three thousand, nine hundred eighty-one".