994543561 has 16 divisors (see below), whose sum is σ = 1106208000. Its totient is φ = 886579200.

The previous prime is 994543559. The next prime is 994543579. The reversal of 994543561 is 165345499.

It is a cyclic number.

It is not a de Polignac number, because 994543561 - 2¹ = 994543559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (994543541) 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 in 15 ways as a sum of consecutive naturals, for example, 125641 + ... + 133321.

It is an arithmetic number, because the mean of its divisors is an integer number (69138000).

Almost surely, 2^994543561 is an apocalyptic number.

994543561 is the 14104-th centered decagonal number.

It is an amenable number.

994543561 is a deficient number, since it is larger than the sum of its proper divisors (111664439).

994543561 is a wasteful number, since it uses less digits than its factorization.

994543561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7920.

The product of its digits is 583200, while the sum is 46.

The square root of 994543561 is about 31536.3847167046. The cubic root of 994543561 is about 998.1778688547.

The spelling of 994543561 in words is "nine hundred ninety-four million, five hundred forty-three thousand, five hundred sixty-one".