999538543 has 2 divisors, whose sum is σ = 999538544. Its totient is φ = 999538542.

The previous prime is 999538541. The next prime is 999538571. The reversal of 999538543 is 345835999.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (345835999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999538543 - 2¹ = 999538541 is a prime.

Together with 999538541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999538541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499769271 + 499769272.

It is an arithmetic number, because the mean of its divisors is an integer number (499769272).

Almost surely, 2^999538543 is an apocalyptic number.

999538543 is a deficient number, since it is larger than the sum of its proper divisors (1).

999538543 is an equidigital number, since it uses as much as digits as its factorization.

999538543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5248800, while the sum is 55.

The square root of 999538543 is about 31615.4794839490. The cubic root of 999538543 is about 999.8461573336.

The spelling of 999538543 in words is "nine hundred ninety-nine million, five hundred thirty-eight thousand, five hundred forty-three".