143959561 has 8 divisors (see below), whose sum is σ = 151704000. Its totient is φ = 136231920.

The previous prime is 143959537. The next prime is 143959589. The reversal of 143959561 is 165959341.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143959561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143959591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15915 + ... + 23263.

It is an arithmetic number, because the mean of its divisors is an integer number (18963000).

Almost surely, 2^143959561 is an apocalyptic number.

It is an amenable number.

143959561 is a deficient number, since it is larger than the sum of its proper divisors (7744439).

143959561 is a wasteful number, since it uses less digits than its factorization.

143959561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8399.

The product of its digits is 145800, while the sum is 43.

The square root of 143959561 is about 11998.3149233549. The cubic root of 143959561 is about 524.0992093587.

The spelling of 143959561 in words is "one hundred forty-three million, nine hundred fifty-nine thousand, five hundred sixty-one".