143561561 has 16 divisors (see below), whose sum is σ = 175996800. Its totient is φ = 115230720.

The previous prime is 143561557. The next prime is 143561567. The reversal of 143561561 is 165165341.

It is not a de Polignac number, because 143561561 - 2² = 143561557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143561567) 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 15 ways as a sum of consecutive naturals, for example, 18536 + ... + 25113.

It is an arithmetic number, because the mean of its divisors is an integer number (10999800).

Almost surely, 2^143561561 is an apocalyptic number.

143561561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

143561561 is a deficient number, since it is larger than the sum of its proper divisors (32435239).

143561561 is a wasteful number, since it uses less digits than its factorization.

143561561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43696.

The product of its digits is 10800, while the sum is 32.

The square root of 143561561 is about 11981.7177816872. The cubic root of 143561561 is about 523.6157772795.

The spelling of 143561561 in words is "one hundred forty-three million, five hundred sixty-one thousand, five hundred sixty-one".