143105561 has 4 divisors (see below), whose sum is σ = 143404800. Its totient is φ = 142806324.

The previous prime is 143105537. The next prime is 143105581. The reversal of 143105561 is 165501341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 143105561 - 2¹⁸ = 142843417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 143105561.

It is not an unprimeable number, because it can be changed into a prime (143105531) 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 in 3 ways as a sum of consecutive naturals, for example, 148901 + ... + 149858.

It is an arithmetic number, because the mean of its divisors is an integer number (35851200).

Almost surely, 2^143105561 is an apocalyptic number.

It is an amenable number.

143105561 is a deficient number, since it is larger than the sum of its proper divisors (299239).

143105561 is an equidigital number, since it uses as much as digits as its factorization.

143105561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299238.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 143105561 is about 11962.6736560018. The cubic root of 143105561 is about 523.0607957481.

The spelling of 143105561 in words is "one hundred forty-three million, one hundred five thousand, five hundred sixty-one".