99999543 has 36 divisors (see below), whose sum is σ = 158530680. Its totient is φ = 55901664.

The previous prime is 99999541. The next prime is 99999547. The reversal of 99999543 is 34599999.

It is not a de Polignac number, because 99999543 - 2¹ = 99999541 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999541) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 917373 + ... + 917481.

It is an arithmetic number, because the mean of its divisors is an integer number (4403630).

Almost surely, 2^99999543 is an apocalyptic number.

99999543 is a deficient number, since it is larger than the sum of its proper divisors (58531137).

99999543 is a wasteful number, since it uses less digits than its factorization.

99999543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 198 counting only the distinct ones).

The product of its digits is 3542940, while the sum is 57.

The square root of 99999543 is about 9999.9771499739. The cubic root of 99999543 is about 464.1581762915.

The spelling of 99999543 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred forty-three".