842043561 has 8 divisors (see below), whose sum is σ = 1127671584. Its totient is φ = 558888960.

The previous prime is 842043557. The next prime is 842043563. The reversal of 842043561 is 165340248.

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

It is not a de Polignac number, because 842043561 - 2² = 842043557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (842043563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617560 + ... + 618921.

It is an arithmetic number, because the mean of its divisors is an integer number (140958948).

Almost surely, 2^842043561 is an apocalyptic number.

It is an amenable number.

842043561 is a deficient number, since it is larger than the sum of its proper divisors (285628023).

842043561 is a wasteful number, since it uses less digits than its factorization.

842043561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236711.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 842043561 is about 29017.9868529848. The cubic root of 842043561 is about 944.3033268427.

The spelling of 842043561 in words is "eight hundred forty-two million, forty-three thousand, five hundred sixty-one".