999318543 has 32 divisors (see below), whose sum is σ = 1388221632. Its totient is φ = 638976000.

The previous prime is 999318521. The next prime is 999318553. The reversal of 999318543 is 345813999.

It is a happy number.

It is a Cunningham number, because it is equal to 31612²-1.

It is not a de Polignac number, because 999318543 - 2¹⁶ = 999253007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999318553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3192555 + ... + 3192867.

It is an arithmetic number, because the mean of its divisors is an integer number (43381926).

Almost surely, 2^999318543 is an apocalyptic number.

999318543 is a deficient number, since it is larger than the sum of its proper divisors (388903089).

999318543 is a wasteful number, since it uses less digits than its factorization.

999318543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715.

The product of its digits is 1049760, while the sum is 51.

The square root of 999318543 is about 31611.9999841832. Note that the first 4 decimals coincide. The cubic root of 999318543 is about 999.7727960489.

The spelling of 999318543 in words is "nine hundred ninety-nine million, three hundred eighteen thousand, five hundred forty-three".