10999543 has 4 divisors (see below), whose sum is σ = 11477808. Its totient is φ = 10521280.

The previous prime is 10999523. The next prime is 10999559. The reversal of 10999543 is 34599901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10999543 - 2¹⁷ = 10868471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10999496 and 10999505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10999523) 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 3 ways as a sum of consecutive naturals, for example, 239098 + ... + 239143.

It is an arithmetic number, because the mean of its divisors is an integer number (2869452).

Almost surely, 2^10999543 is an apocalyptic number.

10999543 is a deficient number, since it is larger than the sum of its proper divisors (478265).

10999543 is an equidigital number, since it uses as much as digits as its factorization.

10999543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478264.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 10999543 is about 3316.5558942976. Note that the first 3 decimals coincide. The cubic root of 10999543 is about 222.3949291388.

The spelling of 10999543 in words is "ten million, nine hundred ninety-nine thousand, five hundred forty-three".