999999539 has 12 divisors (see below), whose sum is σ = 1256198832. Its totient is φ = 779219760.

The previous prime is 999999527. The next prime is 999999541. The reversal of 999999539 is 935999999.

It is not a de Polignac number, because 999999539 - 2¹⁶ = 999934003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999999599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 589472 + ... + 591165.

It is an arithmetic number, because the mean of its divisors is an integer number (104683236).

Almost surely, 2^999999539 is an apocalyptic number.

999999539 is a deficient number, since it is larger than the sum of its proper divisors (256199293).

999999539 is a wasteful number, since it uses less digits than its factorization.

999999539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180666 (or 1180655 counting only the distinct ones).

The product of its digits is 71744535, while the sum is 71.

The square root of 999999539 is about 31622.7693126329. The cubic root of 999999539 is about 999.9998463333. Note that the first 3 decimals are identical.

The spelling of 999999539 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred thirty-nine".