143605661 has 2 divisors, whose sum is σ = 143605662. Its totient is φ = 143605660.

The previous prime is 143605639. The next prime is 143605669. The reversal of 143605661 is 166506341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93973636 + 49632025 = 9694^2 + 7045^2 .

It is a cyclic number.

It is not a de Polignac number, because 143605661 - 2¹⁸ = 143343517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143605669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71802830 + 71802831.

It is an arithmetic number, because the mean of its divisors is an integer number (71802831).

Almost surely, 2^143605661 is an apocalyptic number.

It is an amenable number.

143605661 is a deficient number, since it is larger than the sum of its proper divisors (1).

143605661 is an equidigital number, since it uses as much as digits as its factorization.

143605661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 143605661 is about 11983.5579441166. The cubic root of 143605661 is about 523.6693874789.

The spelling of 143605661 in words is "one hundred forty-three million, six hundred five thousand, six hundred sixty-one".