999539841 has 4 divisors (see below), whose sum is σ = 1332719792. Its totient is φ = 666359892.

The previous prime is 999539833. The next prime is 999539873. The reversal of 999539841 is 148935999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 148935999 = 3 ⋅49645333.

It is not a de Polignac number, because 999539841 - 2³ = 999539833 is a prime.

It is the 31616-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999539831) by changing a digit.

It is a nontrivial repunit in base 31615.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166589971 + ... + 166589976.

It is an arithmetic number, because the mean of its divisors is an integer number (333179948).

Almost surely, 2^999539841 is an apocalyptic number.

It is an amenable number.

999539841 is a deficient number, since it is larger than the sum of its proper divisors (333179951).

999539841 is a wasteful number, since it uses less digits than its factorization.

999539841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333179950.

The product of its digits is 3149280, while the sum is 57.

The square root of 999539841 is about 31615.5000118613. The cubic root of 999539841 is about 999.8465901333.

The spelling of 999539841 in words is "nine hundred ninety-nine million, five hundred thirty-nine thousand, eight hundred forty-one".