143205481 has 2 divisors, whose sum is σ = 143205482. Its totient is φ = 143205480.

The previous prime is 143205479. The next prime is 143205499. The reversal of 143205481 is 184502341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131882256 + 11323225 = 11484^2 + 3365^2 .

It is a cyclic number.

It is not a de Polignac number, because 143205481 - 2¹ = 143205479 is a prime.

It is a super-2 number, since 2×143205481² = 41015619576882722, which contains 22 as substring.

Together with 143205479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (143202481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71602740 + 71602741.

It is an arithmetic number, because the mean of its divisors is an integer number (71602741).

Almost surely, 2^143205481 is an apocalyptic number.

143205481 is the 7569-th centered pentagonal number.

It is an amenable number.

143205481 is a deficient number, since it is larger than the sum of its proper divisors (1).

143205481 is an equidigital number, since it uses as much as digits as its factorization.

143205481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 143205481 is about 11966.8492511605. The cubic root of 143205481 is about 523.1825056127.

The spelling of 143205481 in words is "one hundred forty-three million, two hundred five thousand, four hundred eighty-one".